1. S. Chandrasekhar, An Introduction to the Study of Stellar Structures. University of Chicago Press, 1939.
2. M.K. Kwong and Y. Li., Uniqueness of radial solutions of semilinear elliptic equations. Trans. Amer. Math. Soc.,333 (1992), 339–363.
3. S.S. Lin, On the existence of positive radial solutions for nonlinear elliptic equations in annular domains. J. Differential Equations,81 (1989), 221–233.
4. T. Makino, Mathematical Aspects of the Euler-Poisson Equation for the Evolution of Gaseous Stars. Lecture Notes 1993, National Chiao-Tung University, Hsin-chu, Taiwan, March 1993.
5. T. Makino, On the spherically symmetric motion of self-gravitating isentropic gas surrounding a solid ball. Preprint.