@article{CTGDC_1987__28_4_303_0,
     author = {Kamps, Klaus Heiner},
     title = {Note on the gluing theorem for groupoids and {Van} {Kampen's} theorem},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {303--306},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {28},
     number = {4},
     year = {1987},
     mrnumber = {926548},
     zbl = {0658.55008},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1987__28_4_303_0/}
}