1. Weiss, L. 1967:The Cell Periphery, Metastasis and Other Contact Phenomena. Amsterdam: North-Holland Publ. Co., and New York: Wiley.
2. Derjaguin, B. V. and Landau, L. D. 1941. Theory of the stability of strongly charged lyophobic sols and the adhesion of strongly charged particles in solutions of electrolytes. Acta Physicochem. USSR14: 633–656.
3. Verwey, E. J. W. and Overbeek, J. T. G. 1948.Theory of the stability of lyophobic colloids. Amsterdam: Elsevier.
4. Hamaker, H. C. 1937. The London-Van der Waals attraction between spherical particles. Physica4: 1058–1072.
5. Moore, W. J. 1962.Physical Chemistry. New Jersey: Prentice Hall.