1. H. Schlichting, Boundary Layer Theory, 6th ed., McGraw-Hill (1968).
2. L. I. Sedov, Mechanics of a Continuous Medium [in Russian], Vol. 2, Nauka, Moscow (1970).
3. B. Deryagin and M. Kusakov, ?Properties of thin fluid layers and their influence on the interaction of solid surfaces,? Izv. Akad. Nauk SSSR, Ser. Khim., No. 5 (1936).
4. A. Scheludko, ?Sur certaines particularites des lames mousseuses,? Proc. Konink. Nederl. Akad. Wetensch., Ser. B,65, No. 1 (1962).
5. A. Scheludko and E. Manev, ?Critical thickness of rupture of chlorbenzene and aniline films,? Trans. Faraday Soc.,64, Pt. 4 (1968).