1. Agemi, R.: “Mixed problems for the linearized shallow water equations”, Comm. Partial Differential Equations 5 (1980), 645–681.
2. Agmon, S.: “Problèmes mixtes pour les equations hyperboliques d’ordre superieure”, Colloques Internationaux du C.R.N.S. (1963), 13–18.
3. Ben-Dor, G., and I. Glass: “Domains and boundaries of non-stationary oblique shock-wave reflexions, I. Diatomic gas”, J. Fluid Mech. 92 (1979), 459–496.
4. Courant, R., and K. O. Friedrichs: Supersonic Flow and Shock Waves, Wiley-Interscience, New York, 1949.
5. DiPerna, R.: “Uniqueness of solutions of hyperbolic conservation laws”, Indiana Univ. Math. J. 28 (1979), 137–187.