1. Bosma, P.B., de Rooij, W.A.: Astron. Astrophys. 126, 283 (1983)
2. Chandrasekhar, S.: Radiative Transfer. Dover, New York (1960)
3. Das, R.N., Bera, R.: arXiv:0711.3336 [astro-ph] (2007)
4. Davidović, D.M., Vukanić, J., Arsenović, D.: Icarus 194, 389 (2008)
5. Domke, H.: J. Quant. Spectrosc. Radiat. Transf. 39, 283 (1988)