@article{SM_1974_22_3_a3,
     author = {S. V. Polin},
     title = {On the homological classification of small categories},
     journal = {Sbornik. Mathematics},
     pages = {386--409},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1974_22_3_a3/}
}