@incollection{SB_1977-1978__20__277_0, author = {Malgrange, Bernard}, title = {L'involutivit\'e des caract\'eristiques des syst\`emes diff\'erentiels et microdiff\'erentiels}, booktitle = {S\'eminaire Bourbaki : vol. 1977/78, expos\'es 507-524}, author = {Collectif}, series = {S\'eminaire Bourbaki}, note = {talk:522}, publisher = {Springer-Verlag}, number = {20}, year = {1979}, zbl = {0423.46033}, mrnumber = {554227}, language = {fr}, url = {http://archive.numdam.org/item/SB_1977-1978__20__277_0/} }