@article{BSMF_1974__102__435_0,
     author = {Rezzouk, Abdenour},
     title = {Quelques propri\'et\'es du noyau d'un op\'erateur diff\'erentiel lin\'eaire non hypoelliptique, \`a coefficients constants},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {435--447},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {102},
     year = {1974},
     doi = {10.24033/bsmf.1788},
     mrnumber = {51 #6114},
     zbl = {0305.47028},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1788/}
}