@article{BSMF_1957__85__15_0,
     author = {Mizohata, Sigeru},
     title = {Hypoellipticit\'e des \'equations paraboliques},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {15--50},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {85},
     year = {1957},
     doi = {10.24033/bsmf.1479},
     mrnumber = {20 #3381},
     zbl = {0078.08801},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1479/}
}