1. Busbridge, I. W., , The Mathematics of Radiative Transfer, Cambridge Tracts in Mathematics and Mathematical Physics, no. 50, Cambridge University Press, 1960,
2. Chandrasekhar, S., , Radiative Transfer, Clarendon Press, Oxford, 1950,
3. Meaning of successive iteration of the auxiliary equation in the theory of radiative transfer;Dave;Astrophys. J.,1964
4. Equations of radiative transfer in a planetary spherical atmosphere;Lenoble;Proc. Natl. Acad. Sci. U. S.,1961
5. A complete solution of X- and F-equations of Chandrasekhar;Mullikin;Astrophys. J.,1962