1. K. P. Belov, K. M. Bol’shova, and T. A. Elkina, Izv. Akad. Nauk SSSR, Ser. Fiz. 21, 1047 (1957).
2. C. P. Poole and H. A. Farach, Z. Phys. B: Condens. Matter 47, 55 (1982).
3. J. M. D. Coey, J. Appl. Phys. 49, 1646 (1978).
4. B. N. Goshchitskiĭ, A. N. Men’, I. A. Sinitskiĭ, and Yu. G. Chukalkin, Structure and Magnetic Properties of Oxide Magnets Irradiated by Fast Neutrons (Nauka, Moscow, 1986) [in Russian].
5. J. L. Dormann and M. Nogues, J. Phys: Condens. Matter 2, 1223 (1990).