@article{05672973,
title = {Third Mac Lane cohomology via categorical rings.},
journal = {Journal of Homotopy and Related Structures},
volume = {2},
year = {2007},
pages = {187-216},
zbl = {1184.18014},
language = {en},
url = {http://dml.mathdoc.fr/item/05672973}
}
Jibladze, M.; Pirashvili, T. Third Mac Lane cohomology via categorical rings.. Journal of Homotopy and Related Structures, Tome 2 (2007) pp. 187-216. http://gdmltest.u-ga.fr/item/05672973/