1. G.S. Kass, L. Hoehm, J. Soc. Cosm. Chem. 12, 146 (1961)
2. S. Margater, J. Soc. Cosmet. Chem. 19, 361 (1968)
3. H.H. Tucker, J. Soc. Cosmet. Chem. 18, 609 (1967)
4. M. Altman, M.M. Rieger, J. Soc. Cosmet. Chem. 19, 141 (1968)
5. F. Brody, M.S. Burns, J. Soc. Cosmet. Chem. 19, 361 (1968)