@article{ASENS_1979_4_12_2_235_0,
     author = {Gallot, S.},
     title = {\'Equations diff\'erentielles caract\'eristiques de la sph\`ere},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {235--267},
     publisher = {Elsevier},
     volume = {4e s{\'e}rie, 12},
     number = {2},
     year = {1979},
     doi = {10.24033/asens.1366},
     mrnumber = {80h:58051},
     zbl = {0412.58009},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/asens.1366/}
}