@article{SEDP_1990-1991____A1_0,
     author = {Joly, J. L. and M\'etivier, G. and Rauch, J.},
     title = {Remarques sur l'optique g\'eom\'etrique non lin\'eaire multidimensionnelle},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:1},
     pages = {1--17},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1990-1991},
     mrnumber = {1131574},
     zbl = {0749.35055},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1990-1991____A1_0/}
}