1. G. A. Volkova, N. N. Kirillova, E. N. Pavlovskaya, and A. V. Yakovleva, Zh. Prikl. Spektrosk. 41, 691 (1984).
2. U. Kogelschatz, in Proceedings of the XX International Conference on Phenomena in Ionized Gases, 1991, p. 218.
3. G. N. Gerasimov and G. A. Volkova, Kvantovaya Élektron. (Moscow) 24, 219 (1997).
4. B. Eliasson and U. Kogelschatz, Appl. Phys. B B46, 299 (1988).
5. X. Xu, Y. Li, and Y. Xu, in Proceedings of the Gas Discharge Conference, Greifswald, 1997, Vol. 1, p. 184.