1. Li, T.T., Qin, T.: Physics and partial differential equations. Volume 1. Translated from the Chinese original by Yachun Li. Society for Industrial and Applied Mathematics (SIAM), Philadelphia, PA; Higher Education Press, Beijing. x+264 pp. , (2012) ISBN: 978-1-611972-26-9
2. Jenssen, H.K., Luo, Y.S.:Self-similar generalized Riemann problems for the 1-D isothermal Euler system. Z. Angew. Math. Phys. 72(2), Paper No. 61, 18pp (2021)
3. Hu, Y.B., Li, J.Q., Sheng, W.C.: Degenerate Goursat-type boundary value problems arising from the study of two-dimensional isothermal Euler equations. Z. Angew. Math. Phys. 63(6), 1021–1046 (2012)
4. Alinhac, S.: Hyperbolic partial differential equations. Universitext. Springer, Dordrecht, . xii+150 pp. (2009) ISBN: 978-0-387-87822-5
5. Chang, T., Hsiao, L.: The Riemann problem and interaction of waves in gas dynamics. Pitman Monographs and Surveys in Pure and Applied Mathematics, 41. Longman Scientific & Technical, Harlow; copublished in the United States with John Wiley & Sons, Inc., New York, x+272 pp. (1989) ISBN: 0-582-01378-X