1. V. A. Ambartsumyan, Scientific Works, Vol. 1 [in Russian], Izd. Akad. Nauk Arm. SSR, Erevan (1960).
2. S. Chandrasekhar, Radiative Transfer, Oxford (1950).
3. V. V. Sobolev, Transfer of Radiative Energy in the Atmospheres of Stars and Planets [in Russian], Gostekhizdat (1956).
4. V. V. Sobolev, Scattering of Light in the Atmospheres of Planets [in Russian], Nauka, Moscow (1972).
5. H. C. van de Hulst, Multiple Light Scattering. Tables, Formulas and Applications, Vols. I and II, Academic Press (1980).