1. Kaminskii, A.A., Crystalline Lasers: Physical Processes and Operative Schemes, Boca Raton, FL: CRC Press, 1996.
2. Fuks, H., Kaczmarek, S.M., Leniec, G., Macalik, L., Macalik, B., and Hanuza, J., Opt. Mater., 2010, vol. 32, no. 12, p. 1260.
3. Sun, T., Zhou, X., Zhang, Y., Chqn, S., Liu, S., Kong, Y., and Xu, J., Mater. Res. Bull., 2012, vol. 47, no. 11, p. 3233.
4. Zapart, W., Zapart, M.B., Kowalczyk, R., Maternicki, K., and Maczka, M., Ferroelectrics, 2011, vol. 418, no. 1, p. 164.
5. Karapetyan, V.E. and Morozov, A.M., Izv. Akad. Nauk SSSR, Ser. Neorg. Mater., 1968, vol. 4, no. 11, p. 2039.