1. P.-H. Chavanis, Int. J. Mod. Phys. B 20, 3113 (2006)
2. T. Padmanabhan, Phys. Report 188, 285 (1990)
3. W.C. Saslow, Gravitational physics of stellar and galactic system (Cambridge University Press, New York, 1987)
4. S. Chandrasekhar, An introduction to the theory of a cellar structure (Dover Publication, New York, 1942)
5. W. Thirring, Z. Phys. 235, 339, (1970)