@article{SEDP_1990-1991____A20_0,
     author = {Serre, D.},
     title = {Quelques m\'ethodes d'\'etude de la propagation d'oscillations hyperboliques non lin\'eaires},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:20},
     pages = {1--18},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1990-1991},
     mrnumber = {1131593},
     zbl = {0755.35071},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1990-1991____A20_0/}
}