1. Plazma v lazerakh (Plasma in Lasers), Bekefi, G., Ed., Moscow: Energoizdat, 1982.
2. Eletskii, A.V. and Smirnov, B.M.,Fizicheskie protsessy v gazovykh lazerakh (Physical Processes in Gas Lasers), Moscow: Energoatomizdat, 1986.
3. Tarasenko, V.F. and Yakovlenko, S.I.,Kvantovaya Elektron., 1997, vol. 24, no. 12, p. 1145.
4. Sinkevich, O.A. and Trofimov, Yu.V.,Dokl. Akad. Nauk SSSR, 1979, vol. 249, no. 3, p. 597.
5. Asinovskii, E.I., Vasilyak, L.M., and Markovets, V.V.,Teplofiz. Vys. Temp., 1983, vol. 21, no. 3, p. 577.