Sur un exemple d'équation linéaire hyperbolique n'ayant pas de solution
Journées équations aux dérivées partielles (1992), article no. 14, 6 p. 
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Egorov, Yuri V. Sur un exemple d'équation linéaire hyperbolique n'ayant pas de solution. Journées équations aux dérivées partielles (1992), article  no. 14, 6 p. http://archive.numdam.org/item/JEDP_1992____A14_0/

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