1. Yu. K. Voronko and A. A. Sobol, Proc. (Tr.) P.N. Lebedev Phys. Inst. 98, 41 (1977).
2. A. A. Kaminskii, Laser Crystals, Their Physics and Properties (Nauka, Moscow, 1975; Springer, Berlin, 1981).
3. V. I. Solomonov and S. G. Mihailov, Pulsed Cathodoluminescence and its Application for Condensed Substance Analysis (Ural Division Ross. Akad. Nauk, Ekaterinburg, 2003).
4. N. S. Kovaleva and B. G. Ivanov, J. Appl. Spectrosc. 27, 546 (1977).
5. E. Zych, C. Brecher, A. J. Wojtowicz, and H. Lingertat, J. Lumin. 75, 193 (1997).