Necessary conditions for strong hyperbolicity of first order systems
Journées équations aux dérivées partielles (1989), article no. 8, 16 p. 
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     author = {Matsumoto, Waichiro and Yamahara, Hideo},
     title = {Necessary conditions for strong hyperbolicity of first order systems},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {8},
     pages = {1--16},
     publisher = {Ecole polytechnique},
     year = {1989},
     zbl = {0703.35100},
     mrnumber = {1030823},
     language = {en},
     url = {http://www.numdam.org/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://www.numdam.org/item/JEDP_1989____A8_0/

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