1. Boyd, I.W. and Zhang, J.-Y., Mater. Res. Soc. Symp. Proc., 2000, vol. 617, p. J.4.4.1.
2. Polunin, G.S., Kourenkov, V.V., and Polunina, E.G., J. Refract. Surg., 1998, vol. 14, no. 2, p. 230.
3. Golovitskii, A.P. and Kan, S.N., Opt. Spektrosk., 1993, vol. 75, no. 3, p. 604 [Opt. Spectrosc. (Engl. Transl.), vol. 75, no. 3, p. 357].
4. Lomaev, M.I., Panchenko, A.N., and Sosnin, E.A., Zh. Tekh. Fiz., 1998, vol. 68, no. 2, p. 64 [Tech. Phys. (Engl. Transl.), vol. 43, no. 2, p. 192].
5. Panchenko, A.N. and Tarasenko, V.F., Opt. Spektrosk., 1998, vol. 84, no. 3, p. 389 [Opt. Spectrosc. (Engl. Transl.), vol. 84, no. 3, p. 337].