1. V. F. Ivlev and V. M. Rudyak, in: Magnetic Structure of Ferromagnets [in Russian], SO AN SSSR, Novosibirsk (1960), p. 143.
2. V. M. Rudyak, Dokl. Akad. Nauk SSSR,164, 4, 782 (1965).
3. Yu. N. Kharitonov, Pribory i Tekh. Éksperim.,6, 206 (1966).
4. Yu. N. Kharitonov, Uch. Zap. Kalininskogo Pedinstituta,40, 225 (1966).
5. Yu. N. Kharitonov, Izvestiya VUZ., Fizika, No. 12, 112 (1967).