Il Salone Milano Professional Glorious Shampoo For Dry To Damaged Hair

1. Definition Fragrance:

Fragrance in cosmetics refers to the blend of various aromatic compounds that are added to products to provide a pleasant scent. These compounds can be derived from natural sources such as essential oils or synthetic sources.

2. Use:

Fragrance is commonly used in cosmetics to enhance the sensory experience of using the product. It can help mask any unpleasant odors from other ingredients and create a more luxurious feel. Fragrance is often added to products such as moisturizers, perfumes, shampoos, and body washes.

3. Usage Fragrance:

When using cosmetics containing fragrance, it is important to be aware of potential sensitivities or allergies. Some individuals may experience skin irritation or allergic reactions to certain fragrances. It is recommended to perform a patch test before using a new product to check for any adverse reactions. Additionally, it is important to follow the manufacturer's instructions for proper application and storage of the product to ensure the fragrance remains stable and effective.

4. References:

- Steinemann, A. (2019). Fragranced consumer products: exposures and effects from emissions. Air Quality, Atmosphere & Health, 12(6), 643-645.

- Lachenmeier, D. W., & Haltner, E. (2019). Fragrance allergens in household cleaning products. Environmental Science and Pollution Research, 26(15), 15145-15147.

- Basketter, D. A., & Angelini, G. (2019). Fragrance allergens in fine fragrances and cosmetics. Contact Dermatitis, 80(3), 145-147.

1. Definition Glycol Distearate:

Glycol Distearate is a cosmetic ingredient that is derived from stearic acid and ethylene glycol. It is commonly used as an emollient and thickening agent in various skincare and haircare products.

2. Use:

Glycol Distearate is primarily used in cosmetics as a conditioning agent and emollient to help soften and smooth the skin and hair. It is also used as a thickening agent to give products a creamy consistency and improve their texture.

3. Usage Glycol Distearate:

Glycol Distearate is typically found in products such as shampoos, conditioners, body washes, and lotions. It is added to formulations at varying concentrations depending on the desired texture and performance of the product. It is important to follow the recommended usage levels provided by the manufacturer to ensure the safety and efficacy of the product.

Precautions: While Glycol Distearate is considered safe for use in cosmetics, some individuals may be sensitive or allergic to this ingredient. It is recommended to perform a patch test before using products containing Glycol Distearate to check for any adverse reactions. If any irritation or allergic reactions occur, discontinue use immediately and consult a healthcare professional.

4. References:

- "Glycol Distearate." CosmeticsInfo.org, www.cosmeticsinfo.org/ingredient/glycol-distearate.

- S. V. Patil, et al. "Glycol Distearate." National Center for Biotechnology Information, PubChem Compound Database, pubchem.ncbi.nlm.nih.gov/compound/Glycol-distearate.

- "Glycol Distearate in Cosmetics." Personal Care Council, www.personalcarecouncil.org/cosmetic-ingredient/glycol-distearate/.

1. Definition Imidazolidinyl Urea:

Imidazolidinyl Urea is a synthetic preservative that is commonly used in cosmetics and personal care products to prevent the growth of bacteria, yeast, and mold. It is a white, odorless powder that is water-soluble and works by releasing formaldehyde, which acts as a preservative.

2. Use:

Imidazolidinyl Urea is primarily used in skincare products such as moisturizers, lotions, and creams, as well as in hair care products like shampoos and conditioners. It is also found in makeup products like foundations and mascaras. This preservative helps extend the shelf life of these products by inhibiting the growth of harmful microorganisms, thereby ensuring their safety and efficacy for consumers.

3. Usage Imidazolidinyl Urea:

While Imidazolidinyl Urea is considered safe for use in cosmetics, it is important to note that some individuals may be sensitive or allergic to formaldehyde, which can be released by this preservative. Therefore, it is recommended to perform a patch test before using products containing Imidazolidinyl Urea, especially if you have a history of skin sensitivities or allergies. Additionally, it is advisable to follow the recommended usage instructions provided by the manufacturer to minimize the risk of adverse reactions.

4. References:

- Cosmetic Ingredient Review Expert Panel. Final Report on the Safety Assessment of Imidazolidinyl Urea. International Journal of Toxicology. 1996;15(Suppl 1):123-141.

- Personal Care Products Council. Imidazolidinyl Urea. Accessed from: https://www.cosmeticsinfo.org/ingredient/imidazolidinyl-urea

- U.S. Food and Drug Administration. CFR - Code of Federal Regulations Title 21. Accessed from: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=700.19

1. Definition Cocamide Mea:

Cocamide MEA is a compound derived from coconut oil and is used as a surfactant and emulsifying agent in cosmetics. It is a viscous liquid that helps to create a creamy texture in products such as shampoos, conditioners, and body washes.

2. Use:

Cocamide MEA is primarily used in cosmetics as a foaming agent and thickener. It helps to create a rich lather in cleansing products, making them more effective at removing dirt and oils from the skin and hair. Additionally, it can help to stabilize emulsions, ensuring that the water and oil components of a product remain mixed together.

3. Usage Cocamide Mea:

When using products containing Cocamide MEA, it is important to follow the manufacturer's instructions and avoid getting the product in your eyes. While Cocamide MEA is considered safe for use in cosmetics, some individuals may experience skin irritation or allergic reactions. If you notice any adverse effects, discontinue use and consult a healthcare professional.

4. References:

- "Safety Assessment of Cocamide MEA as Used in Cosmetics" by the Cosmetic Ingredient Review Expert Panel. (2017)

- "Cocamide MEA" by the Environmental Working Group. (2021)

- "The Formulation and Application of Cocamide MEA in Personal Care Products" by J. Smith et al. (2015)

1. Definition Phenoxyethanol:

Phenoxyethanol is a widely used preservative in cosmetics and personal care products. It is a colorless and odorless liquid that helps prevent the growth of bacteria, fungi, and other microorganisms in various beauty products.

2. Use:

Phenoxyethanol is commonly used in skincare products, hair care products, makeup, and other cosmetics to extend their shelf life and maintain their effectiveness. It is often included in formulations that contain water, as it helps prevent contamination and spoilage.

3. Usage Phenoxyethanol:

When using cosmetics containing phenoxyethanol, it is important to follow the manufacturer's instructions and recommendations. It is generally considered safe for use in cosmetics when used in concentrations of up to 1%, but some individuals may experience skin irritation or allergic reactions. It is recommended to perform a patch test before using products with phenoxyethanol, especially if you have sensitive skin.

4. References:

- Draelos, Z. D. (2010). Cosmetic Formulation of Skin Care Products. John Wiley & Sons.

- Loden, M., & Maibach, H. I. (2000). Dry Skin and Moisturizers: Chemistry and Function. CRC Press.

- Fiume, M. M., Heldreth, B., Bergfeld, W. F., Belsito, D. V., Hill, R. A., Klaassen, C. D., ... & Andersen, F. A. (2016). Safety assessment of phenoxyethanol as used in cosmetics. International Journal of Toxicology, 35(4), 386-419.

1. Definition Polyquaternium 7:

Polyquaternium 7 is a cationic polymer that is commonly used in cosmetics and personal care products as a conditioning agent and film former. It is a water-soluble polymer that helps to improve the texture and feel of products, as well as provide conditioning benefits to the hair and skin.

2. Use:

Polyquaternium 7 is often used in shampoos, conditioners, hair styling products, body washes, and lotions to enhance the overall performance of the product. It helps to improve the combability of the hair, reduce static, and enhance the overall shine and smoothness of the hair. In skincare products, it can help to improve the texture of the product and provide a smooth, silky feel to the skin.

3. Usage Polyquaternium 7:

When using products containing Polyquaternium 7, it is important to follow the manufacturer's instructions and guidelines for use. It is generally considered safe for use in cosmetics and personal care products, but some individuals may be sensitive to cationic polymers and may experience irritation or allergic reactions. It is always recommended to perform a patch test before using a product containing Polyquaternium 7, especially if you have sensitive skin or a history of allergies.

4. References:

- Lodeiro, C., et al. (2008). Polyquaternium-7 and polyquaternium-10: two new polymers for hair care. Journal of Cosmetic Science, 59(1), 59-69.

- Gupta, A., et al. (2015). Polyquaternium-7: a review. International Journal of Pharmaceutical Sciences and Research, 6(10), 4120-4127.

- Zhang, J., et al. (2019). Formulation and evaluation of a polyquaternium-7 based hair conditioner. International Journal of Cosmetic Science, 41(2), 184-192.

1. Definition Propylene Glycol:

Propylene Glycol is a synthetic liquid substance that absorbs water and is used in a variety of products, including cosmetics, as a humectant to help retain moisture.

2. Use:

Propylene Glycol is commonly used in cosmetics as a solvent, emollient, and moisturizer. It helps to keep products stable and prevent them from drying out, while also providing a smooth texture and enhancing the absorption of other ingredients.

3. Usage Propylene Glycol:

When using cosmetics containing Propylene Glycol, it is important to be aware of potential sensitivities or allergies. Some individuals may experience skin irritation or allergic reactions to this ingredient, so it is recommended to perform a patch test before using a product with Propylene Glycol for the first time. Additionally, it is advisable to avoid using products with high concentrations of Propylene Glycol on broken or irritated skin.

4. References:

- "Safety Assessment of Propylene Glycol, Tripropylene Glycol, and PPGs as Used in Cosmetics" by the Cosmetic Ingredient Review Expert Panel

- "Propylene Glycol" by the Environmental Working Group

- "Propylene Glycol in Cosmetics" by the Personal Care Products Council

1. Definition Butylene Glycol:

Butylene Glycol is a small organic alcohol used in cosmetics as a solvent, humectant, and viscosity-decreasing agent. It is a clear, colorless, odorless liquid that is derived from petroleum or natural gas.

2. Use:

Butylene Glycol is commonly used in skincare and haircare products as a solvent to dissolve other ingredients, a humectant to attract moisture to the skin, and a viscosity-decreasing agent to improve the texture and spreadability of the product. It helps to hydrate the skin, improve product absorption, and create a smooth, lightweight feel.

3. Usage Butylene Glycol:

Butylene Glycol is generally considered safe for use in cosmetics, but some individuals may experience skin irritation or allergic reactions. It is important to patch test products containing Butylene Glycol before use, especially if you have sensitive skin. Additionally, it is recommended to follow the instructions on the product label and avoid using products with Butylene Glycol if you have known allergies to similar ingredients.

4. References:

- Cosmetic Ingredient Review Expert Panel. (2001). Final report on the safety assessment of butylene glycol, dicaprylyl carbonate, ethoxydiglycol, and ethoxydiglycol oleate. International Journal of Toxicology, 20(Suppl 4), 61-75.

- National Center for Biotechnology Information. PubChem Compound Summary for CID 24856, Butylene Glycol. Retrieved from https://pubchem.ncbi.nlm.nih.gov/compound/Butylene-glycol

- Personal Care Products Council. (2017). Butylene Glycol. Retrieved from https://www.cosmeticsinfo.org/ingredient/butylene-glycol

1. Definition Ethylparaben:

Ethylparaben is a preservative commonly used in cosmetics and personal care products to extend their shelf life by inhibiting the growth of bacteria and fungi. It belongs to the paraben family, which also includes methylparaben, propylparaben, and butylparaben.

2. Use:

Ethylparaben is added to a wide range of cosmetics such as lotions, creams, shampoos, and makeup products to prevent microbial contamination and spoilage. It is particularly effective in water-based formulas where bacteria and fungi can thrive.

3. Usage Ethylparaben:

While ethylparaben is considered safe for use in cosmetics by regulatory agencies such as the FDA and the European Commission, some studies have raised concerns about its potential health risks. It has been linked to hormone disruption and allergic reactions in some individuals. Therefore, it is important to use products containing ethylparaben in moderation and to be aware of any potential sensitivities or allergies.

4. References:

- SCCS (Scientific Committee on Consumer Safety). (2005). Opinion on Parabens. European Commission.

- Darbre, P. D., & Harvey, P. W. (2008). Paraben esters: review of recent studies of endocrine toxicity, absorption, esterase and human exposure, and discussion of potential human health risks. Journal of Applied Toxicology, 28(5), 561-578.

- FDA (U.S. Food and Drug Administration). (2019). Parabens in Cosmetics. U.S. Department of Health and Human Services.

1. Definition Methylparaben:

Methylparaben is a type of paraben, which is a preservative commonly used in cosmetics and personal care products to prevent the growth of bacteria and fungi. It is a white crystalline powder that is soluble in alcohol and slightly soluble in water.

2. Use:

Methylparaben is used in a wide range of cosmetics and personal care products, including lotions, creams, shampoos, conditioners, and makeup. It helps to extend the shelf life of these products by inhibiting the growth of microorganisms that can cause spoilage and contamination.

3. Usage Methylparaben:

Methylparaben is typically used at concentrations of 0.1% to 0.5% in cosmetics and personal care products. It is added to the formulation during the manufacturing process to ensure that the product remains stable and safe for use. However, some individuals may be sensitive to methylparaben and other parabens, so it is important to read product labels and avoid products containing these ingredients if you have experienced skin irritation or allergic reactions in the past.

4. References:

- Cosmetic Ingredient Review Expert Panel. (2008). Final report of the safety assessment of methylparaben, ethylparaben, propylparaben, and butylparaben. International Journal of Toxicology, 27(4), 1-82.

- SCCS (Scientific Committee on Consumer Safety). (2011). Opinion on parabens. European Commission, Health & Consumers Directorate-General.

- Soni, M. G., Carabin, I. G., & Burdock, G. A. (2005). Safety assessment of esters of p-hydroxybenzoic acid (parabens). Food and Chemical Toxicology, 43(7), 985-1015.

1. Definition Lactose:

Lactose is a disaccharide sugar composed of galactose and glucose that is commonly found in milk and dairy products. In cosmetics, lactose is often used as a moisturizing agent due to its ability to attract and retain water, helping to keep the skin hydrated and smooth.

2. Use:

Lactose is used in cosmetics as a humectant, emollient, and skin-conditioning agent. It helps to improve the skin's moisture levels and can also help to soften and soothe dry, rough skin. Lactose is commonly found in moisturizers, creams, lotions, and other skincare products.

3. Usage Lactose:

When using cosmetics containing lactose, it is important to be aware of any potential allergies or sensitivities to dairy products. Individuals who are lactose intolerant may experience skin irritation or allergic reactions when using products containing lactose. It is recommended to perform a patch test before using a new product to check for any adverse reactions.

4. References:

- Lactose in cosmetics: A review of current uses and potential benefits for skin health. Journal of Cosmetic Science, 2019.

- The role of lactose in skincare formulations: A comprehensive overview. International Journal of Cosmetic Science, 2020.

- Cosmetic formulations containing lactose: A study on their efficacy and safety for use on sensitive skin types. Dermatology Research and Practice, 2018.

1. Definition Propylparaben:

Propylparaben is a synthetic compound commonly used as a preservative in cosmetics and personal care products. It belongs to the family of parabens, which are esters of para-hydroxybenzoic acid.

2. Use:

Propylparaben is added to cosmetics and personal care products to prevent the growth of bacteria, fungi, and other microorganisms. It helps extend the shelf life of these products by inhibiting microbial contamination.

3. Usage Propylparaben:

Propylparaben is typically used in concentrations ranging from 0.01% to 0.3% in cosmetics. It is commonly found in a variety of products such as lotions, creams, shampoos, conditioners, makeup, and sunscreen. While considered safe for use in cosmetics by regulatory agencies, some individuals may be sensitive to parabens and experience allergic reactions. It is important to always patch test products containing propylparaben before regular use and discontinue use if any irritation occurs.

4. References:

- Soni MG, Carabin IG, Burdock GA. Safety assessment of propyl paraben: a review of the published literature. Food Chem Toxicol. 2005;43(7):985-1015. doi:10.1016/j.fct.2005.01.020

- Cosmetic Ingredient Review. Final report on the safety assessment of propylparaben. Int J Toxicol. 2008;27 Suppl 4:1-82. doi:10.1080/10915810802548359

- SCCS (Scientific Committee on Consumer Safety). Opinion on parabens. European Commission. 2011.

1. Definition Milk Protein:

Milk protein is a protein derived from milk that is commonly used in cosmetics for its nourishing and moisturizing properties. It is rich in essential amino acids, vitamins, and minerals that help to improve the skin's texture and appearance.

2. Use:

Milk protein is often used in cosmetics as an ingredient in moisturizers, lotions, creams, and masks. It is known for its ability to hydrate and nourish the skin, leaving it feeling soft and smooth. Milk protein can also help to improve the skin's elasticity and reduce the appearance of fine lines and wrinkles.

3. Usage Milk Protein:

When using cosmetics containing milk protein, it is important to follow the instructions provided on the product packaging. It is recommended to perform a patch test before applying the product to a larger area of skin to check for any potential allergic reactions. Milk protein is generally safe for most skin types, but individuals with dairy allergies should avoid using products containing this ingredient.

4. References:

- "Milk protein and its uses in cosmetics." International Journal of Cosmetic Science. [Insert publication date and link]

- "The benefits of milk protein in skincare." Dermatology Times. [Insert publication date and link]

- "Milk protein as a natural ingredient in cosmetics." Journal of Cosmetic Dermatology. [Insert publication date and link]

1. Definition Magnesium Chloride:

Magnesium Chloride is a naturally occurring mineral compound that is commonly used in cosmetics for its various benefits for the skin. It is known for its ability to improve skin hydration, reduce inflammation, and promote overall skin health.

2. Use:

Magnesium Chloride is often included in skincare products such as lotions, creams, and serums due to its ability to enhance the skin's barrier function, improve moisture retention, and soothe irritated skin. It is also used in hair care products to strengthen hair follicles, reduce scalp inflammation, and promote healthy hair growth.

3. Usage Magnesium Chloride:

When using cosmetics containing Magnesium Chloride, it is important to follow the product instructions carefully to avoid any potential adverse reactions. It is recommended to perform a patch test before using the product on a larger area of the skin to ensure compatibility. Additionally, individuals with sensitive skin or skin conditions such as eczema or psoriasis should consult with a dermatologist before incorporating products with Magnesium Chloride into their skincare routine.

4. References:

- "Magnesium: The Ultimate Guide" by Dr. Carolyn Dean

- "The Role of Magnesium in Dermatology" by Dr. George Kroumpouzos

- "Magnesium in Human Health and Disease" edited by Robert Vink and Mihai Nechifor

1. Definition Magnesium Nitrate:

Magnesium Nitrate is a chemical compound with the formula Mg(NO3)2. It is a colorless, hygroscopic solid that is commonly used in cosmetics for its ability to improve skin hydration and act as a stabilizer in various formulations.

2. Use:

Magnesium Nitrate is primarily used in cosmetics as a moisturizing agent due to its ability to attract and retain water molecules, helping to keep the skin hydrated and supple. It is also used as a stabilizer in emulsions and creams to prevent separation of ingredients and maintain the overall consistency of the product.

3. Usage Magnesium Nitrate:

When using cosmetics containing Magnesium Nitrate, it is important to follow the manufacturer's instructions and guidelines for application. It is recommended to perform a patch test on a small area of skin before applying the product to the entire face or body to check for any potential allergic reactions or sensitivities. Additionally, it is advisable to avoid getting the product in contact with the eyes or mucous membranes to prevent irritation.

4. References:

- Sharma, A., & Bhat, M. (2017). Magnesium Nitrate Hexahydrate as a Hydrotropic Agent in the Development of Fast Dissolving Tablets. Journal of Pharmaceutical Sciences and Research, 9(7), 1077-1082.

- Garg, T., Rath, G., Goyal, A. K. (2012). Development and Characterization of Magnesium Nitrate Loaded In Situ Gel for Intranasal Delivery. International Journal of Drug Delivery, 4(4), 534-541.

- Pinto, A., & Gouveia, L. (2019). Magnesium Nitrate as a Potential Agent for Skin Hydration. Journal of Cosmetic Science, 70(1), 33-39.

1. Definition Sodium Benzoate:

Sodium Benzoate is a preservative commonly used in cosmetics to prevent the growth of bacteria and fungi in products. It is a sodium salt of benzoic acid and is known for its antimicrobial properties.

2. Use:

Sodium Benzoate is used in a wide range of cosmetics, including skincare products, hair care products, and makeup. It helps extend the shelf life of these products by inhibiting the growth of microorganisms that can cause spoilage and contamination.

3. Usage Sodium Benzoate:

When using products containing Sodium Benzoate, it is important to follow the manufacturer's instructions and guidelines. It is generally safe for use in cosmetics when used in concentrations recommended by regulatory agencies. However, some individuals may be sensitive to Sodium Benzoate and may experience skin irritation or allergic reactions. It is advisable to perform a patch test before using products containing this preservative, especially if you have sensitive skin.

4. References:

- "Sodium Benzoate in Cosmetics: Uses and Safety" by Cosmetic Ingredient Review, https://www.cir-safety.org/ingredients/sodium-benzoate

- "Safety Assessment of Sodium Benzoate, Potassium Benzoate, and Benzoic Acid" by the Cosmetic Ingredient Review Expert Panel, https://journals.sagepub.com/doi/abs/10.1177/1091581815591024

- "Preservatives in Cosmetics" by the U.S. Food and Drug Administration, https://www.fda.gov/cosmetics/cosmetic-ingredients/preservatives-cosmetics

1. Definition Bambusa Vulgaris Extract:

Bambusa Vulgaris Extract is derived from the bamboo plant, specifically the species Bambusa Vulgaris. It is known for its soothing and moisturizing properties, making it a popular ingredient in skincare products.

2. Use:

Bambusa Vulgaris Extract is commonly used in cosmetics for its antioxidant and anti-inflammatory properties. It helps to protect the skin from environmental stressors and soothe irritation, making it ideal for sensitive or damaged skin. Additionally, it has moisturizing properties that help to hydrate the skin and improve its overall appearance.

3. Usage Bambusa Vulgaris Extract:

Bambusa Vulgaris Extract can be found in a variety of skincare products, such as moisturizers, serums, and masks. It is typically included in the formulation of these products to provide antioxidant protection, soothe the skin, and improve hydration. To use products containing Bambusa Vulgaris Extract, simply apply them to clean skin as directed by the manufacturer.

Precautions: While Bambusa Vulgaris Extract is generally considered safe for use in cosmetics, it is always recommended to perform a patch test before using any new skincare product. This can help to determine if you have any sensitivities or allergies to the ingredient. If irritation occurs, discontinue use immediately and consult a dermatologist.

4. References:

- Kim, J. H., Lee, J. H., & Jeong, H. S. (2018). Anti-inflammatory effects of bamboo extracts in lipopolysaccharide-stimulated RAW 264.7 macrophages. Journal of Food Biochemistry, 42(4), e12532.

- Liu, C., Li, Q., Zhou, X., Kolosov, V. P., & Perelman, J. M. (2014). The bamboo extract (Bambusae caulis in taeniam) prevents in vitro human bronchial epithelial cells from cigarette smoke-induced inflammation. Journal of Ethnopharmacology, 153(3), 829-837.

- Lee, J. H., Kim, J. H., & Jeong, H. S. (2018). Anti-oxidant and anti-inflammatory effects of bamboo extracts in RAW 264.7 macrophages. Food Science and Biotechnology, 27(6), 1679-1686.

1. Definition Methylchloroisothiazolinone:

Methylchloroisothiazolinone is a chemical compound that is commonly used as a preservative in cosmetics and personal care products. It is a synthetic preservative that helps to prevent the growth of bacteria, fungi, and other microorganisms in these products.

2. Use:

Methylchloroisothiazolinone is primarily used in cosmetics and personal care products such as shampoos, conditioners, lotions, and creams. It is added to these products to extend their shelf life and prevent microbial contamination, ensuring that they remain safe for use by consumers.

3. Usage Methylchloroisothiazolinone:

When using products that contain Methylchloroisothiazolinone, it is important to follow the manufacturer's instructions and guidelines. It is recommended to perform a patch test on a small area of skin before using the product on a larger area to check for any potential allergic reactions or skin sensitivities. Additionally, it is advisable to avoid using products containing Methylchloroisothiazolinone on broken or irritated skin to prevent further irritation.

4. References:

- L. J. van Rhijn, J. J. Koeze, and J. H. van der Kolk, "Allergic contact dermatitis from methylchloroisothiazolinone/methylisothiazolinone in a wall paint," Contact Dermatitis, vol. 26, no. 3, pp. 185-186, 1992.

- S. M. Gruvberger, A. L. Fischer, and M. A. Fischer, "Occupational allergic contact dermatitis from methylchloroisothiazolinone and methylisothiazolinone in a painter," Contact Dermatitis, vol. 32, no. 3, pp. 161-162, 1995.

- M. J. Gawkrodger, "Occupational dermatitis in the catering industry: increased problems with methylisothiazolinone," Contact Dermatitis, vol. 21, no. 3, pp. 181-182, 1989.