@incollection{AST_1983__107-108__43_0,
     author = {Libermann, Paulette},
     title = {Probl\`emes d'\'equivalence et g\'eom\'etrie symplectique},
     booktitle = {IIIe rencontre de g\'eom\'etrie du Schnepfenried (Volume 1) - 10 - 15 mai 1982},
     series = {Ast\'erisque},
     pages = {43--68},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {107-108},
     year = {1983},
     mrnumber = {753129},
     zbl = {0529.53030},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1983__107-108__43_0/}
}