@article{SEDP_1973-1974____A1_0,
     author = {Boutet de Monvel, L.},
     title = {Op\'erateurs hypoelliptiques \`a caract\'eristiques doubles},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:1 et 2},
     pages = {1--16},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1973-1974},
     mrnumber = {425335},
     zbl = {0299.35091},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1973-1974____A1_0/}
}