1. 1) J. F. Corbett : Cosmetics & Toiletries, 106 [7], 53 (1991)
2. 2) N. H. Leon : J. Soc. Cosmet. Chem., 23,427 (1972)
3. 3) J. C. Arnaud, P. Bore : J. Soc. Cosmet. Chem., 32,137 (1981)
4. 6) F. E. Wall : “Cosmetics Science and Technology” p. 279, Wiley-Interscience (1972)
5. 11) G. M. Hampton, I. D. Rattee : J. Soc. Dyers Colour., 95,396 (1979)