@article{GDZPPN002186489, title = {On the homology theory of categories. II.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, volume = {253}, year = {1972}, pages = {112-127}, zbl = {0288.18010}, url = {http://dml.mathdoc.fr/item/GDZPPN002186489} }
Hanna, Azmi. On the homology theory of categories. II.. Journal für die reine und angewandte Mathematik, Tome 253 (1972) pp. 112-127. http://gdmltest.u-ga.fr/item/GDZPPN002186489/