1. 1) M. von Smoluchowski : Physiz. Z., 17, 57,585 (1916); Z. Physik. Chem., 92,129 (1917); J. Th. G. Overbeek : “Colloid Science”, Ed., H. R. Kruyt, Vol. 1, p. 278, Elsevier, Amsterdam (1952); J. Halpern : J. Chem. Education, 45,372 (1968)
2. 2) R. S. Hansen and E. J. Derderian : “Foams”, Ed., R. J. Akers, p. 1, Academic Press, New York (1976)
3. 3) J. J. Bikerman : “Surface chemistry”, p. 134, Academic Press (1970)
4. 4) A. W. Adamson : “Physical chemistry of surfaces”, 3 rd Ed., p. 501, John Wiley & Sons, New York (1976)
5. 5) J. M. Dallavalle : “Micromeritics”, 2 nd Ed., n. 19. Academic Press, New York (1952)