@article{SEDP_1971-1972____A20_0,
     author = {Malgrange, B.},
     title = {Sur les points singuliers des \'equations diff\'erentielles},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:20},
     pages = {1--13},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1971-1972},
     mrnumber = {407898},
     zbl = {0252.34031},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1971-1972____A20_0/}
}