@article{GDZPPN002185822,
title = {On the homology theory of categories. I.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {247},
year = {1971},
pages = {133-146},
zbl = {0288.18009},
url = {http://dml.mathdoc.fr/item/GDZPPN002185822}
}
Hanna, Azmi. On the homology theory of categories. I.. Journal für die reine und angewandte Mathematik, Tome 247 (1971) pp. 133-146. http://gdmltest.u-ga.fr/item/GDZPPN002185822/