1. Klassen-Neklyudova, M.V., Bagdasarov, Kh.S., et al., Rubin i sapfir (Ruby and Sapphire), Moscow: Nauka, 1974.
2. Zharov, V.P. and Latyshev, A.S., J. Laser Appl., 1999, vol. 11, p. 80.
3. Keel, D.M., Goldman, M.P., Fitzpatrick, R.E., and Butterwick, K.J., Lasers Surg. Med., 2002, vol. 31, p. 41.
4. Shellock, F.G. and Shellock, V.J., J. Magn. Resonance Imaging, 2005, vol. 6, p. 954.
5. Shevchenko, A.V., Dudnik, E.V., Ruban, A.K., et al., Nauka Proizvodstvu, 2007, no. 6, p. 36.