@article{ASENS_1989_4_22_1_109_0,
author = {Colombini, Ferruccio and Spagnolo, Sergio},
title = {Some examples of hyperbolic equations without local solvability},
journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
volume = {22},
year = {1989},
pages = {109-125},
doi = {10.24033/asens.1578},
mrnumber = {90d:35164},
zbl = {0702.35146},
language = {en},
url = {http://dml.mathdoc.fr/item/ASENS_1989_4_22_1_109_0}
}
Colombini, F.; Spagnolo, S. Some examples of hyperbolic equations without local solvability. Annales scientifiques de l'École Normale Supérieure, Tome 22 (1989) pp. 109-125. doi : 10.24033/asens.1578. http://gdmltest.u-ga.fr/item/ASENS_1989_4_22_1_109_0/
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