@incollection{JEDP_1977____190_0,
     author = {Vaillant, Jean},
     title = {Propri\'et\'e de sym\'etrie des matrices localis\'ees d'une matrice fortement hyperbolique en un point multiple},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     pages = {190--205},
     publisher = {Ecole polytechnique},
     year = {1977},
     mrnumber = {80d:35098},
     zbl = {0385.35043},
     language = {fr},
     url = {http://www.numdam.org/item/JEDP_1977____190_0/}
}