1. Diffuse reflection of light by a foggy medium;Ambarzumian;Dokl. Akad. Nauk SSSR,1943
2. Radiative Transfer;Chandrasekhar,1950
3. On the principle of invariant imbedding and propagation through inhomogeneous media;Bellman,1956
4. The transmission of radiation through an inhomogeneous medium;Sobolev;Dokl. Akad. Nauk SSSR,1956
5. The probabilistic method for problems of radiative transfer. X. Diffuse reflection and transmission in a finite inhomogeneous atmosphere;Ueno;Astrophys. J.,1960