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3. I. A. Smirnov, V. S. Oskotskii, and L. S. Parfen’eva, in Topical Problems of Physics and Chemistry of Rare-Earth Semiconductors. Thematic Collection (Inst. Fiz. Dagestan. Filiala Akad. Nauk SSSR, Makhachkala, 1988), p. 4.
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5. I. A. Smirnov and V. S. Oskotskii, Handbook on the Physics and Chemistry of Rare Earths, Ed. by K. A. Gshneidner, Jr. and L. Eyring (North-Holland, Amsterdam, 1993), Vol. 16, p. 107.