@article{ASENS_1971_4_4_1_21_0,
     author = {Cerezo, A. and Rouvi\`ere, F.},
     title = {R\'esolubilit\'e locale d'un op\'erateur diff\'erentiel invariant du premier ordre},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {21--30},
     publisher = {Elsevier},
     volume = {4e s{\'e}rie, 4},
     number = {1},
     year = {1971},
     doi = {10.24033/asens.1203},
     mrnumber = {45 #7751},
     zbl = {0212.46801},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/asens.1203/}
}