1. Ambartsumian, V.A.: Light scattering by planetary atmospheres. Astron. Zhurnal 19, 30–41 (1942)
2. Ambartsumian, V.A.: Theoretical Astrophysics. Pergamon Press, New York (1958), translation by J.B. Sykes
3. Russian original, Teoreticheskaia Astrofizika, Gostechizdat, Moscow (1952)
4. Avrett, E.H., Hummer, D.G.: Non-coherent scattering II: Line formation with a frequency independent source function. Mon. Not. R. astr. Soc. 130, 295–331 (1965)
5. Bosma, P.B., de Rooij, W.A.: Efficient methods to calculate Chandrasekhar’s H-functions. Astron. Astrophys. 126, 283–292 (1983)