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@article{JRAM_1972__252_151180, author = {Azmi Hanna}, title = {On the homology theory of categories. {II.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {112--127}, publisher = {mathdoc}, volume = {252}, year = {1972}, zbl = {0288.18010}, url = {http://geodesic.mathdoc.fr/item/JRAM_1972__252_151180/} }
Azmi Hanna. On the homology theory of categories. II.. Journal für die reine und angewandte Mathematik, Tome 252 (1972), pp. 112-127. http://geodesic.mathdoc.fr/item/JRAM_1972__252_151180/