1. Tapia O., and Goscinski O.: 1975, Mol. Phys. 29, pp. 1653.
2. Tapia O.: 1978, “Thèse d’Etat, Paris University VI”.
3. Yomosa S.: 1978, J. Phys. Soc. (Japan) 44, pp. 602.
4. Margenau H., and Kestner N.R.: 1969, “Theory of Intramolecular Forces, Pergamon Press, Oxford”.
5. Fontana P.: 1961, Phys. Rev. 123, pp. 1865.