@incollection{AST_1985__130__352_0,
     author = {Laurent, Yves},
     title = {Calcul d'indices et irr\'egularit\'e pour les syst\`emes holonomes},
     booktitle = {Syst\`emes diff\'erentiels et singularit\'es C.I.R.M. 27 juin {\textendash} 9 juillet 1983},
     editor = {Galligo, A. and Granger, M. and Maisonobe, Ph.},
     series = {Ast\'erisque},
     pages = {352--364},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {130},
     year = {1985},
     mrnumber = {804063},
     zbl = {0569.58031},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1985__130__352_0/}
}