@incollection{AST_1978__59-60__7_0,
     author = {Dumortier, F. and Roussarie, R.},
     title = {\'Etude locale des champs de vecteurs \`a param\`etres},
     booktitle = {Journ\'ees singuli\`eres de Dijon},
     series = {Ast\'erisque},
     pages = {7--42},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {59-60},
     year = {1978},
     mrnumber = {542730},
     zbl = {0405.58013},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1978__59-60__7_0/}
}