1. A. Y. Kipnis, B. E. Yavelov, and J. S. Rowlinson, Van der Waals and Molecular Sciences (Oxford, New York, 1996).
2. H. Margenau and N. R. Kestner, Theory of Intermolecular Forces (Pergamon Press, Oxford, 1969).
3. D. Langbein, Theory of Van der Waals Attraction (Springer Verlag, Berlin, 1974).
4. R. Eisenshitz and F. London, Z. Phys. 60, 491 (1930).
5. F. London, Z. Phys. 63, 245 (1930).