@article{SEDP_1978-1979____A4_0,
     author = {Lascar, R.},
     title = {Param\'etrices microlocales de probl\`emes aux limites pour une classe d'\'equations pseudo-diff\'erentielles \`a caract\'eristiques de multiplicit\'e variable},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:4},
     pages = {1--13},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1978-1979},
     zbl = {0404.35097},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1978-1979____A4_0/}
}