1. P. W. Selwood, Magnetochemistry [Russian translation], IL (1958), pp. 279?281.
2. A. Helms and W. Kemm, Z. Anorg. Allgem. Chem.,241, 97 (1939).
3. I. A. Kazarnovskii, G. P. Nikol'skii, and T. A. Abletsova, Dokl. Akad. Nauk SSSR,64 (1949).
4. V. B. Evdokimov and Fen-I Li, Zh. Fiz. Khim.,37, 2791 (1963).
5. A. B. Tsentsiper and M. S. Dobrolyubova, Izv. Akad. Nauk SSSR, Ser. Khim., 175 (1968).