1. Altwood, D. and Florence, A. T., Surfactant Systems, Chapman and Hall, New York, 1983.
2. Bailey, Jr. F. D. and Koleske, J. V., Configuration and hydrodynamic properties of the polyoxyethylene chain in solution, in nonionic surfactants (Schick, M. J. ed.), Marcel Dekker, p. 794, 1967
3. Banker, G. S and Rhodes, C. T., Modern Pharmaceutics, Marcel Dekker, New York, p. 19, 1979
4. Hildebrand, J. H., Prausnitz, J. H. and Scott, R. L., Regular and Related Solutions, Van Nostrand Reinhold, New York, 1970
5. Lee, H. Y., Chung, H. Y., Kim, K. H., Lee, J. J. and Kim, K. W., Induction of differentiation in the cultured F9 teratocarcinoma stem cells by triterpene acids, Journal of Cancer Research and Clinical Oncology, Vol. 120, p. 513–518, 1994