@article{SJL_1969___3_1_0,
     author = {Choquet-Bruhat, Yvonne},
     title = {Ondes asymptotiques et approch\'ees pour un syst\`eme d'\'equations aux d\'eriv\'ees partielles quasi-lin\'eaire},
     journal = {S\'eminaire Jean Leray},
     pages = {1--10},
     publisher = {Coll\`ege de France},
     number = {3},
     year = {1969},
     language = {fr},
     url = {http://www.numdam.org/item/SJL_1969___3_1_0/}
}