1. G. G. Petrash, Usp. Fiz. Nauk, 105, No. 4, 645–676 (1971).
2. N. A. Yudin and N. N. Yudin, Russ. Phys. J., 58, No. 12, 1782–1791 (2015).
3. V. M. Batenin, V. V. Buchanov, M. A. Kazaryan, et al., Lasers on Self-Terminating Transitions of Metal Atoms [in Russian], Nauchnaya Kniga, Moscow (1998).
4. A. G. Grigor’yants, M. A. Kazaryan, and N. A. Lyabin, Metal Vapor Lasers. Design, Characteristics, and Applications [in Russian], Fizmatlit, Moscow (2005).
5. P. A. Bokhan, V. A. Gerasimov, V. I. Solomonov, and V. B. Shcheglov, Kvant. Elektr., 5, No. 10, 2162–2173 (1978).