1. B. A. Zerr, US Patent No. 4612646.
2. V. T. Volov, Kh. D. Lamazhapov, A. D. Margolin, et al., Analysis of Energetic Characteristics of a Vortex Glow Discharge in Application to a CO2-Laser [in Russian], Dep. No. 35-21-B87 in VINITI April 22, 1987 (1987).
3. S. F. Adyasov, A. I. Voronov, V. A. Katulin, et al., Kvant. Elektr.,17, No. 6, 580?588 (1990).
4. R. J. McConnel, US Patent No. 4402574.
5. A. P. Merkulov, Vortical Effect and Its Application in Engineering [in Russian], Moscow (1968).