@article{CTGDC_1992__33_3_237_0,
     author = {Gramain, Andr\'e},
     title = {Le th\'eor\`eme de {Van} {Kampen}},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {237--251},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {33},
     number = {3},
     year = {1992},
     mrnumber = {1186948},
     zbl = {0856.57001},
     language = {fr},
     url = {http://www.numdam.org/item/CTGDC_1992__33_3_237_0/}
}