1. Chandrasekhar, S.: An Introduction to the Study of Stellar Structure. Dover, New York (1967)
2. Fukue, J., Kato, S., Matsumoto, R.: Publ. Astron. Soc. Jpn. 37, 383 (1985)
3. Henyey, L.G., Greenstein, J.L.: Astrophys. J. 93, 70 (1941)
4. Hsieh, S.-H., Spiegel, E.A.: Astrophys. J. 207, 244 (1976)
5. Hubeny, I., Mihalas, D.: Theory of Stellar Atmosphere. Princeton University Press, Princeton (2014)