@article{SEDP_1981-1982____A9_0,
     author = {Nourrigat, J.},
     title = {Hypoellipticit\'e maximale pour le syst\`eme de {Cauchy-Riemann} induit},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:10},
     pages = {1--10},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1981-1982},
     mrnumber = {671607},
     zbl = {0504.35027},
     language = {fr},
     url = {http://archive.numdam.org/item/SEDP_1981-1982____A9_0/}
}