@incollection{AST_1981__89-90__45_0,
     author = {Schapira, P.},
     title = {Une introduction \`a l'\'etude des syst\`emes d' \'equations microdiff\'erentielles},
     booktitle = {Analytic solutions of partial differential equations - Trento, 1981},
     series = {Ast\'erisque},
     pages = {45--83},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {89-90},
     year = {1981},
     zbl = {0512.58032},
     mrnumber = {666403},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1981__89-90__45_0/}
}