@incollection{JEDP_1992____A14_0,
     author = {Egorov, Yuri V.},
     title = {Sur un exemple d'\'equation lin\'eaire hyperbolique n'ayant pas de solution},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {14},
     pages = {1--6},
     year = {1992},
     publisher = {Ecole polytechnique},
     doi = {10.5802/jedp.432},
     mrnumber = {93a:35004d},
     language = {fr},
     url = {https://www.numdam.org/articles/10.5802/jedp.432/}
}