Geodesic
Necessary conditions for strong hyperbolicity of first order systems
Journées équations aux dérivées partielles (1989), article no. 8, 16 p.

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     year = {1989},
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     url = {http://geodesic.mathdoc.fr/item/JEDP_1989____A8_0/}
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Matsumoto, Waichiro; Yamahara, Hideo. Necessary conditions for strong hyperbolicity of first order systems. Journées équations aux dérivées partielles (1989), article  no. 8, 16 p. http://geodesic.mathdoc.fr/item/JEDP_1989____A8_0/

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