1. S. V. Gaponenko, Optical Properties of Semiconductor Nanocrystals (Cambridge University Press, Cambridge, 1998), p. 241.
2. P. D. Persans, T. M. Hayes, and L. B. Lurio, J. Non-Cryst. Solids 349, 315 (2004).
3. N. V. Nikonorov, A. I. Sidorov, V. A. Tsekhomskii, and O. P. Vinogradova, Opt. Zh. 75(12), 61 (2008) [J. Opt. Technol. 75, 809 (2008)].
4. A. V. Dotsenko, L. B. Glebov, and V. A. Tsekhomsky, in Physics and Chemistry of Photochromic Glasses (CRC Press LLC, 1998), p. 190.
5. P. M. Valov and V. I. Leiman, Fiz. Tverd. Tela (St. Petersburg) 51, 1607 (2000) [Phys. Solid State 52, 1703 (2009)].