Hong, J.M.-K. and Quita, R.M. 2017. Approximation of generalized Riemann solutions to compressible Euler-Poisson equations of isothermal flows in spherically symmetric space-times. Tamkang Journal of Mathematics. 48, 1 (Mar. 2017), 73–94. DOI:https://doi.org/10.5556/j.tkjm.48.2017.2274.