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2. McCutchen (published annually). “Detergents and Emulsifiers,” Allied, NJ.
3. Physico-Chemical Properties of Selected Anionic, Cationic and Nonionic Surfactants;Van Os,1993
4. Handbook of Surfactants;Porter,1991
5. Principles of Polymer Science and Technology in Cosmetics and Personal Care;Tadros,1999