1. S. Chandrasekhar, Stochastic Problems in Physics and Astronomy (AIP, New York, 1943; Inostrannaya Literatura, Moscow, 1947).
2. L. M. Biberman, V. S. Vorob’ev, and I. T. Yakubov, Kinetics of Nonequilibrium Low-Temperature Plasmas (Nauka, Moscow, 1982; Consultants Bureau, New York, 1987).
3. V. V. Ivanov, Radiative Transport and Spectra of Heavenly Bodies (Nauka, Moscow, 1969).
4. B. Kaulakys and A. Ciziunas, J. Phys. B 20, 1031 (1987).
5. N. N. Bezuglov, Opt. Spektrosk. 57, 737 (1984) [Opt. Spectrosc. 57, 448 (1984)].