@article{BSMF_1967__95__45_0,
     author = {Baouendi, Mohamed Salah},
     title = {Sur une classe d'op\'erateurs elliptiques d\'eg\'en\'er\'es},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {45--87},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {95},
     year = {1967},
     doi = {10.24033/bsmf.1647},
     mrnumber = {37 #4398},
     zbl = {0179.19501},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1647/}
}