@article{SJL_1964-1965___2_1_0,
     author = {Leray, Jean},
     title = {\'Equations hyperboliques non-strictes : contre-exemples, du type de {Giorgi,} aux th\'eor\`emes d'existence et d'unicit\'e},
     journal = {S\'eminaire sur les \'equations aux d\'eriv\'ees partielles},
     pages = {1--15},
     year = {1964-1965},
     publisher = {Coll\`ege de France},
     number = {2},
     language = {fr},
     url = {https://www.numdam.org/item/SJL_1964-1965___2_1_0/}
}