@article{GAU_1976-1977__4__A2_0,
     author = {Christol, Gilles},
     title = {Structure de {Frob\'enius} des syst\`emes diff\'erentiels, {I} et {II}},
     journal = {Groupe de travail d'analyse ultram\'etrique},
     note = {talk:3},
     pages = {1--2},
     publisher = {Secr\'etariat math\'ematique},
     volume = {4},
     year = {1976-1977},
     zbl = {0375.12027},
     language = {fr},
     url = {http://www.numdam.org/item/GAU_1976-1977__4__A2_0/}
}