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@article{JRAM_1971__248_151114, author = {Azmi Hanna}, title = {On the homology theory of categories. {I.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {133--146}, publisher = {mathdoc}, volume = {248}, year = {1971}, zbl = {0288.18009}, url = {http://geodesic.mathdoc.fr/item/JRAM_1971__248_151114/} }
Azmi Hanna. On the homology theory of categories. I.. Journal für die reine und angewandte Mathematik, Tome 248 (1971), pp. 133-146. http://geodesic.mathdoc.fr/item/JRAM_1971__248_151114/