1. D. R. Behrendt, S. Legvold, and F. H. Spedding, Phys. Rev. 109(5), 1544 (1958).
2. K. P. Belov, Rare-Earth Magnetic Materials and Their Application (Nauka, Moscow, 1980).
3. S. A. Nikitin, Magnetic Properties of Rare-Earth Metals and Alloys (Mosk. Gos. Univ., Moscow, 1989).
4. Y. Shinoda and K. Taima, Phys. Soc. Jpn. 64, 1334 (1995).
5. Ch. Ya. Mulyukov, G. F. Korznikova, and S. A. Nikitin, Fiz. Tverd. Tela (St. Petersburg) 37(8), 2481 (1995) [Phys. Solid State 37, 1359 (1995)].