@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}, volume = {28}, year = {1987}, pages = {303-306}, mrnumber = {926548}, zbl = {0658.55008}, language = {en}, url = {http://dml.mathdoc.fr/item/CTGDC_1987__28_4_303_0} }
Kamps, Klaus Heiner. Note on the gluing theorem for groupoids and Van Kampen's theorem. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 28 (1987) pp. 303-306. http://gdmltest.u-ga.fr/item/CTGDC_1987__28_4_303_0/
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