1. R. G. Grebenshchikov, Zh. Neorg. Khim., Vol. 9, No. 5, p. 1038 (1964).
2. K. B. Yatsimirskii, Thermochemistry of Complex Compounds [in Russian], Izd. Akad. Nauk SSSR, Moscow (1951).
3. R. G. Grebenshchikov and N. A. Toropov, Izv. Akad. Nauk SSSR, Neorg. Mat. (in press 1967).
4. M. Kh. Karapet’yants, Methods of Comparative Computation of Physicochemical Properties [in Russian], Izd. Nauka, Moscow (1965).
5. R. G. Grebenshchikov and N. A. Toropov, Dokl. Akad. Nauk SSSR, Vol. 158, No. 3, p. 710 (1964).