1. E. J. W. Verwey and J. T. G.Overbeek, Theory of the Stability of Lyophobic Colloids, Elsevier, New York, 1948.
2. Colloid Science, ed. H. R. Kruyt. Elsevier, Amsterdam, 1952, vol. 1 and 2.
3. The London—van der Waals attraction between spherical particles