1. Shock Waves and Reaction-Diffusion Equations;Smoller,1983
2. Linear and Nonlinear Waves;Whitham,1974
3. A criterion for certain wave structures in systems that change type;Keyfitz,1989
4. Systems of conservation laws of mixed type;Mock;J. Differential Equations,1980
5. Admissibility of solutions to the Riemann problem for systems of mixed type;Warnecke,1990