@incollection{AST_1985__130__365_0,
     author = {Mebkhout, Z.},
     title = {Sur le th\'eor\`eme de semi-continuit\'e de l'irr\'egularit\'e des \'equations diff\'erentielles},
     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 = {365--419},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {130},
     year = {1985},
     mrnumber = {804064},
     zbl = {0592.32009},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1985__130__365_0/}
}