Tarnavsky, G. “Nonuniqueness of Shockwave Structures in Real Gases: the Mach and/Or Regular Reflection”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), vol. 4, no. 4, Oct. 2003, pp. 258-77, https://en.num-meth.ru/index.php/journal/article/view/97.