1. A.W. Adamson, A.P. Gast, Physical Chemistry of Surfaces, 6th ed. (Wiley, New York, 1997) (the 4th edition, as single author, is from 1982)
2. J.J. Bikerman, Physical Surfaces (Academic Press, New York, 1970), p. 239
3. H. Bouasse, Capillarité, Phńomènes Superficiels (Delagrave, Paris, 1924)
4. H.J. Butt, M. Kappl, Surface and Interfacial Forces (Wiley-VCH, Weinheim, 2010) (and references therein)
5. H.B.G. Casimir, Proc. Nederl. Akad. Wissensch. B 51, 793 (1948)