@article{SEDP_1990-1991____A17_0,
     author = {Xu, C. J.},
     title = {Probl\`eme de {Dirichlet} pour les \'equations associ\'ees \`a un syst\`eme de champs de vecteurs},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:17},
     pages = {1--10},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1990-1991},
     mrnumber = {1131590},
     zbl = {0779.35033},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1990-1991____A17_0/}
}