1. Laser Pumping Chambers and Laser Cavity Filters, (Kigre, Inc., Hilton Head, S.C., 1993).
2. G. E. Malashkevich, V. I. Aleksandrov, A. L. Blinov, and M. A. Borik, Publication of the Academy of Sciences of the USSR No. 1334624 [in Russian] (Akad. Nauk SSSR, 1987).
3. I. A. Zhmyreva, V. P. Kolobkov, G. O. Karapetyan, and E. G. Bondarenko, Zh. Prikl. Spektrosk. 8, 271 (1990).
4. M. C. Farries, P. R. Morkel, and J. E. Townsend, Proc. SPIE 1171, 271 (1990).
5. É. L. Demskaya and S. S. Pivovarov, Fiz. Khim. Stekla 16, 605 (1990).