1. A. A. Samokhvalov, V. V. Osipov, N. I. Solin, I. Ya. Korenblit, and A. P. Galdicas, J. Magn. Magn. Mater. 46, 191 (1984); A. A. Samokhvalov, N. I. Solin, N. A. Viglin, and V. V. Osipov, Phys. Status Solidi B 169, K93 (1992); 169, K93 (1992); I. Ya. Korenblit, A. A. Samokhvalov, and V. V. Osipov, Sov. Sci. Rev. A., Phys. 8, 447 (1987).
2. H. W. Lehmann and F. P. Emmenegger, Solid State Commun. 7, 965 (1969).
3. N. A. Viglin, V. V. Osipov, and A. A. Samokhvalov, Fiz. Tverd. Tela (Leningrad) 33, 2695 (1991) [Sov. Phys. Solid State 33, 1523 (1991)].
4. N. I. Solin, B. N. Filippov, I. Yu. Shumilov, and A. A. Samokhvalov, Fiz. Tverd. Tela (St. Petersburg) 35, 1613 (1993) [Phys. Solid State 35, 812 (1993)].
5. V. V. Osipov, A. A. Samokhvalov, and V. A. Kostylev, Fiz. Tverd. Tela (Leningrad) 29, 2809 (1987) [Sov. Phys. Solidi 29, 1613 (1987)].