1. Allen, C. W.: 1963,Astrophysical Quantities, 2nd ed., Athlone Press, London.
2. Chandrasekhar, S.: 1964,Astrophys. J. 140, 599.
3. Darwin, G. H.: 1906,Phil. Trans. Roy. Soc. London A 206, 161.
4. Hattori, T., Nakano, T., and Hayashi, C.: 1969,Prog. Theor. Phys. 42, 781.
5. Jeans, J. H.: 1919,Problems of Cosmogony and Stellar Dynamics, Cambridge University Press, Cambridge.