@incollection{AST_2004__296__11_0,
     author = {Bertrand, Daniel},
     title = {Travaux de {J.-P.} {Ramis} sur les \'equations diff\'erentielles lin\'eaires},
     booktitle = {Analyse complexe, syst\`emes dynamiques, sommabilit\'e des s\'eries divergentes et th\'eories galoisiennes (I) - Volume en l'honneur de Jean-Pierre Ramis},
     editor = {Loday-Richaud Mich\`ele},
     series = {Ast\'erisque},
     pages = {11--20},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {296},
     year = {2004},
     mrnumber = {2135681},
     zbl = {1077.34004},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_2004__296__11_0/}
}