@article{ASENS_1971_4_4_1_31_0,
     author = {Baouendi, M. S. and Goulaouic, C.},
     title = {\'Etude de l'analyticit\'e et de la r\'egularit\'e {Gevrey} pour une classe d'op\'erateurs elliptiques d\'eg\'en\'er\'es},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {31--46},
     publisher = {Elsevier},
     volume = {4e s{\'e}rie, 4},
     number = {1},
     year = {1971},
     doi = {10.24033/asens.1204},
     mrnumber = {44 #4366},
     zbl = {0231.35032},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.1204/}
}