@article{CTGDC_1976__17_4_343_0, author = {Brown, Ronald and Spencer, Christopher B.}, title = {Double groupoids and crossed modules}, journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques}, volume = {17}, year = {1976}, pages = {343-362}, mrnumber = {440553}, zbl = {0344.18004}, language = {en}, url = {http://dml.mathdoc.fr/item/CTGDC_1976__17_4_343_0} }
Brown, Ronald; Spencer, Christopher B. Double groupoids and crossed modules. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 17 (1976) pp. 343-362. http://gdmltest.u-ga.fr/item/CTGDC_1976__17_4_343_0/
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