1. D. I. Bednarchuk and V. A. Bernatskii, Izv. Akad. Nauk SSSR, Ser. Fiz., No. 10, 1923–1928 (1985).
2. D. I. Bednarchuk, V. A. Bernatskii, and A. E. Pomazan, in: Abstracts of Reports of the XXX Conference on Luminescence (Inorganic Crystals) [in Russian], Rovno (1984), p. 182.
3. V. A. Bernatskii, Zh. Prikl. Spektrosk.,55, No. 3, 510–513 (1991).
4. V. A. Bernatskii, in: Abstract of Reports of the VII All-Union (I International) Conference “Physics, Chemistry, and Technology of Luminophors” [in Russian], Stavropol' (1992), p. 152.
5. N. A. Vlasenko, L. F. Gudymenko, M. G. Lisitsa, and V. S. Khomchenko, Dokl. Akad. Nauk Ukr. SSR, Ser. A, No. 4, 359–362 (1977).