no. 4
Double groupoids and crossed modules
Cahiers de topologie et géométrie différentielle, Tome 17 (1976) no. 4, pp. 343-362.
corrigé par Erratum à l'article « Double groupoids and crossed modules » 
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     title = {Double groupoids and crossed modules},
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     number = {4},
     year = {1976},
     mrnumber = {440553},
     zbl = {0344.18004},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1976__17_4_343_0/}
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Brown, Ronald; Spencer, Christopher B. Double groupoids and crossed modules. Cahiers de topologie et géométrie différentielle, Tome 17 (1976) no. 4, pp. 343-362. http://archive.numdam.org/item/CTGDC_1976__17_4_343_0/

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