1. A. D. Colley, F. Villarreal, A. A. Cameron, et al., in Gas Laser: Recent Developments and Future Prospects, Ed. by W. J. Witteman and V. N. Ochkin; NATO ASI Series 3 10, 89 (1995).
2. Y. B. Udalov, S. N. Tskhai, P. J. M. Peters, et al., in Gas Laser: Recent Developments and Future Prospects, Ed. by W. J. Witteman and V. N. Ochkin; NATO ASI Series 3 10, 73 (1995).
3. Xin Jianguo, Zhang Wang, and Jiao Wentao, Appl. Phys. Lett. 75, 1369 (1999).
4. V. V. Kunn, V. G. Leont’ev, M. Z. Novgorodov, et al., in Proceedings of the 12th International Conference on Phenomena in Ionized Gases, Haboken, 1995, Vol. 3, p. 67.
5. A. A. Ionin, Yu. M. Klimachev, I. V. Kochetov, et al., Preprint No. 53 (Lebedev Physical Institute, Russ. Acad. Sci., Moscow, 2001).