@incollection{AST_1984__116__98_0,
     author = {Haefliger, A. and Quach Ngoc Du},
     title = {Appendice : {Une} pr\'esentation du groupe fondamental d'une {Orbifold}},
     booktitle = {Structure transverse des feuilletages},
     series = {Ast\'erisque},
     pages = {98--107},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {116},
     year = {1984},
     zbl = {0556.57032},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1984__116__98_0/}
}