@incollection{JEDP_1986____A16_0,
     author = {G\'erard, Patrick and Rauch, Jeff},
     title = {Propagation de la r\'egularit\'e locale de solutions d'\'equations hyperboliques non lin\'eaires},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {16},
     pages = {1--9},
     publisher = {Ecole polytechnique},
     year = {1986},
     mrnumber = {874558},
     zbl = {0604.35051},
     language = {fr},
     url = {http://archive.numdam.org/item/JEDP_1986____A16_0/}
}