1. Kok, J. A. and M. M. G. Corbey, Appl. Sci. Res. B7 (1958) 257.
2. Overbeek, J. Th. G., see H. R. Kruyt, Colloid Science I, Elsevier 1952, 58–89, 264–266; H. C. Hamaker, Physica4 (1937) 1058; Verwey, E. J. W. and J. Th. G. Overbeek, Theory of the Stability of Lyophobic Colloids. Elsevier, 1948.
3. Mysels, K. J., Introduction to Colloid Chemistry, p. 176–206, Interscience Publ. Inc., N. York and London, 1959; J. P. Sisley and P. J. Wood, Encyclopedia of surface-active agents, Chemical Publishing Co. Inc., N. York 1952; A. M. Schwartz, J. W. Perry (and J. Berch), Surface active agents (and detergents) I (and II), Intersc. Publ. Inc., N. York and London, 1949 and 1958.
4. Minne, J. L. van der, Rec. Trav. chim.65 (1946) 549; J. L. van der Minne and P. H. J. Hermanie, J. Colloid Sci.8 (1953) 38;7 (1952) 600; M. van der Waarden, J. Colloid Sci.5 (1950) 317, 448;6 (1951) 443; E. L. Mackor and J. H. van der Waals, J. Colloid Sci.7 (1952) 535; E. L. Mackor, J. Colloid Sci.6 (1951) 492.
5. Koelmans, H., Philips Res. Rep.10 (1955) 161.