1. Ambartsumian, V.A.: Light scattering by planetary atmospheres. Astron. Zhurnal 19, 30–41 (1942)
2. Bosma, P.B., de Rooij, W.A.: Efficient methods to calculate Chandrasekhar’s H-functions. Astron. Astrophys. 126, 283–292 (1983)
3. Carrier, G.F., Krook, M., Pearson, C.E.: Functions of a Complex Variable. McGraw-Hill Book Company, New York (1966)
4. Case, K.M., Zweifel, P.: Linear Transport Theory. Addison-Wesley, Reading, MA (1967)
5. Chandrasekhar, S.: Radiative Transfer. Dover Publications, New York (1960)