@article{MAN_1965__162_161336,
     author = {J. LERAY},
     title = {\'Equations {Hyperboliques} {Non-Strictes:} {Contre-Exemples,} du {Type} de {Giorgi,} aux {Th\'eor\`emes} {d'Existence} et {d'Unicit\'e.}},
     journal = {Mathematische Annalen},
     pages = {228--236},
     publisher = {mathdoc},
     volume = {162},
     year = {1965},
     zbl = {0135.15001},
     url = {http://geodesic.mathdoc.fr/item/MAN_1965__162_161336/}
}