1. Thermodynamics, conservation laws, and symmetric forms of differential equations in mechanics of continuous media;Godunov,1995
2. Symmetric positive linear differential equations;Friedrichs;Comm. Pure Appl. Math.,1958
3. Abstract quasilinear evolution equations in a Hubert space with applications to symmetric hyperbolic systems;Okazava;SUT J. Math.,1993
4. Estimate of the time rate of entropy dissipation for systems of conservation laws;Sever;J. of Differential Equations,1996
5. An interesting class of quasilinear systems;Godunov;Sov. Math. Dokl.,1961