1. A. A. Ionin, I. B. Kovsh, V. A. Sobolev, and B. M. Urin, “High-pressure electric-discharge IR lasers and their use, “Itogi Nauki Tekh., VINITI, Radiotekhnika,32, Moscow (1984).
2. N. G. Douglas,Millimeter and Submillimeter Wavelength Lasers, Berlin (1989).
3. G. A. Zalesskaya, D. L. Yakovlev, and M. V. Khodin,Zh. Prikl. Spektrosk.,62, No. 6, 81–86 (1996).
4. A. Olafsson and J. Henningsen,Infrared Phys. Technol.,36, 309–319 (1995).
5. S. E. Bialkowski,Appl. Optics,32, 3177–3189 (1993).