@article{SEDP_1988-1989____A16_0,
     author = {Delort, J.-M.},
     title = {Conormalit\'e des ondes semi-lin\'eaires le long des caustiques},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:15},
     pages = {1--12},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1988-1989},
     mrnumber = {1032291},
     zbl = {0703.35113},
     language = {fr},
     url = {http://archive.numdam.org/item/SEDP_1988-1989____A16_0/}
}