@incollection{AST_1983__109-110__67_0,
     author = {de Jager, E. M.},
     title = {Introduction to the theory of singular perturbations},
     booktitle = {IIIe rencontre de g\'eom\'etrie du Schnepfenried Volume 2 - 10-15 mai 1982},
     series = {Ast\'erisque},
     pages = {67--100},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {109-110},
     year = {1983},
     mrnumber = {753144},
     zbl = {0531.34044},
     language = {en},
     url = {http://www.numdam.org/item/AST_1983__109-110__67_0/}
}