@incollection{SB_1962-1964__8__79_0,
     author = {Malgrange, Bernard},
     title = {Syst\`emes diff\'erentiels \`a coefficients constants},
     booktitle = {S\'eminaire Bourbaki : ann\'ees 1962/63 - 1963/64, expos\'es 241-276},
     series = {S\'eminaire Bourbaki},
     note = {talk:246},
     pages = {79--89},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {8},
     year = {1964},
     mrnumber = {1611532},
     zbl = {0141.27304},
     language = {fr},
     url = {http://archive.numdam.org/item/SB_1962-1964__8__79_0/}
}