1. Maitland, G. C.; Rigby, M.; Smith, E. B.; Wakeham, W. A.: Intermolecular forces. Oxford, Clarendon Press 1981
2. Barker, J. A.; Fisher, R. A.; Watts, R. O.: Mol. Phys. 21 (1971) 657
3. Schaefer, H. E: Modern Theoretical Chemistry. London: Chapman and Hall 1974
4. Sagarik, K.; Ahlrichs, R.: Chem. Phys. Letters 131 (1986) 74–97
5. Hirschfelder, J. O.; Curtiss, C. F.; Bird, R. B.: Molecular theory of gases and liquids. New York: Wiley 1954