@article{CTGDC_1985__26_4_381_0,
author = {Porter, Timothy},
title = {Crossed modules in $Cat$ and a Brown-Spencer theorem for $2$-categories},
journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
volume = {26},
year = {1985},
pages = {381-388},
mrnumber = {816647},
zbl = {0575.18006},
language = {en},
url = {http://dml.mathdoc.fr/item/CTGDC_1985__26_4_381_0}
}
Porter, Timothy. Crossed modules in $Cat$ and a Brown-Spencer theorem for $2$-categories. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 26 (1985) pp. 381-388. http://gdmltest.u-ga.fr/item/CTGDC_1985__26_4_381_0/
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