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@article{MZ_1991__207_2_174290, author = {Heinrich Freist\"uhler}, title = {Linear degeneracy and shock waves.}, journal = {Mathematische Zeitschrift}, pages = {583--596}, publisher = {mathdoc}, volume = {207}, number = {2}, year = {1991}, zbl = {0756.35048}, url = {http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174290/} }
Heinrich Freistühler. Linear degeneracy and shock waves.. Mathematische Zeitschrift, Tome 207 (1991) no. 2, pp. 583-596. http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174290/