1. K. D. Tovstyuk, Semiconductor Materials Science (Nauk. Dumka, Kiev, 1984) [in Russian].
2. Z. S. Medvedeva, Chalcogenides of Elements of Subgroup III of the Periodic System (Nauka, Moscow, 1968) [in Russian].
3. Magnetism of Nanosystems on the Basis of Rare Earth and 3d Transition Metals, Ed. by V. O. Vas’kovskii (Ural. Gos. Univ., Ekaterinburg, 2007), p. 6 [in Russian].
4. A. Kuhn, A. Chevy, and R. Chevalier, Phys. Status Solidi B 31, 469 (1975).
5. I. I. Grigorchak, Z. D. Kovalyuk, and S. P. Yurtsenyuk, Izv. Akad. Nauk SSSR, Neorg. Mater. 17, 412 (1981).