1. H. V. Pikichyan, Astrophysics, 62, 387, 2019.
2. V. V. Sobolev, Radiative Energy Transfer in the Atmospheres of Stars and Planets [in Russian], GITTL, Moscow (1956), 391 pp.
3. N. I. Minin, Theory of Radiative Transfer in Planetary Atmospheres [in Russian], Nauka, gl. red. fiz.-mat. lit., Moscow (1988), 264 pp.
4. H. V. Pikichyan, Astrophysics, 53, 251, 2010.
5. H. H. Kagiwada, R. Kalaba, and S. Ueno, Multiple Scattering Processes. Inverse and Direct, Addison-Wesley (1975), 337 pp.