@incollection{AST_1983__107-108__87_0,
     author = {Bennequin, Daniel},
     title = {Entrelacements et \'equations de {Pfaff}},
     booktitle = {IIIe rencontre de g\'eom\'etrie du Schnepfenried (Volume 1) - 10 - 15 mai 1982},
     series = {Ast\'erisque},
     pages = {87--161},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {107-108},
     year = {1983},
     mrnumber = {753131},
     zbl = {0573.58022},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1983__107-108__87_0/}
}