1. V. D. Shimanovich and L. I. Kiselevskii, Zh. Prikl. Spektr.,5, 3 (1966).
2. L. I. Kiselevskii and V. D. Shimanovich, Opt. i Spektr.,24, 506 (1968).
3. R. W. Larenz, Z. Phys.,129, 327, 343 (1951).
4. K. Bockasten, JOSA,50, 826 (1960).
5. A. S. Pleshanov and S. G. Zaitsev, Physical Gas Dynamics, Heat Transfer, and Thermodynamics of Gases at High Temperatures [in Russian], No. 15, Moscow (1962).