@article{CTGDC_1993__34_4_305_0, author = {Gordon, Robert}, title = {Crossed modules as $G$-categories}, journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques}, volume = {34}, year = {1993}, pages = {305-319}, mrnumber = {1253173}, zbl = {0801.18010}, language = {en}, url = {http://dml.mathdoc.fr/item/CTGDC_1993__34_4_305_0} }
Gordon, Robert. Crossed modules as $G$-categories. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 34 (1993) pp. 305-319. http://gdmltest.u-ga.fr/item/CTGDC_1993__34_4_305_0/
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