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2. Discontinuity relations for changed, compressible, relativistic fluids;Coburn;J. Math. and Mech.,1961
3. Non-linear wave motion;Friedrichs;A.E.C. Research and Development Report, NYO-6486,1958
4. Vector and Tensor Analysis;Coburn,1955
5. Leçons sur la propagation des ondes;Hadamard,1903