@article{BSMF_1966__94__245_0,
     author = {Kato, Y.},
     title = {Op\'erateurs diff\'erentiels partiellement hypoelliptiques},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {245--259},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {94},
     year = {1966},
     doi = {10.24033/bsmf.1641},
     mrnumber = {35 #4587},
     zbl = {0153.41701},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1641/}
}