1. Diffuse reflection of light by a foggy medium;Ambarzumian;C. R. Acad. Sci. U.R.S.S.,1943
2. Theoretical Astrophysics;Ambartsumian (Ambarzumian),1958
3. Radiative Transfer;Chandrasekhar,1960
4. Invariant Imbedding and Radiative Transfer in Slabs of Finite Thickness;Bellman,1963
5. Invariant Imbedding and Time Dependent Transport Processes;Bellman,1964