no. 4
Crossed modules as G-categories
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 34 (1993) no. 4, pp. 305-319 
@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},
     pages = {305--319},
     year = {1993},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {34},
     number = {4},
     mrnumber = {1253173},
     zbl = {0801.18010},
     language = {en},
     url = {https://www.numdam.org/item/CTGDC_1993__34_4_305_0/}
}
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Gordon, Robert. Crossed modules as $G$-categories. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 34 (1993) no. 4, pp. 305-319. https://www.numdam.org/item/CTGDC_1993__34_4_305_0/

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