1. Metiu, H., Kitahara, K., Ross, J.: J. Chem. Phys.64, 292 (1976)
2. Sai-Kit Chan: J. Chem. Phys.67, 5755 (1977)
3. Parliński, K., Sikora, R.: (to be published)
4. Sirotin, Yu., Shaskolskaya, M.P.: Osnovy Kristallofiziki, Table D. 4, Izd. Nauka, Moscow 1975
5. Parliński, K., Wasiutyński, T.: (to be published)