@article{AIF_1990__40_4_849_0,
     author = {Nadir, B. and Varenne, Jean-Pierre},
     title = {R\'egularit\'e conormale classique des probl\`emes de {Cauchy} et de r\'eflexion transverse pour un syst\`eme $2\times 2$ semi-lin\'eaire},
     journal = {Annales de l'Institut Fourier},
     pages = {849--866},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {40},
     number = {4},
     year = {1990},
     doi = {10.5802/aif.1238},
     mrnumber = {92m:35166},
     zbl = {0702.35040},
     language = {fr},
     url = {http://www.numdam.org/articles/10.5802/aif.1238/}
}