@article{1183529117,
author = {Gerstenhaber, Murray},
title = {The third cohomology group of a ring and the commutative cohomology theory},
journal = {Bull. Amer. Math. Soc.},
volume = {73},
number = {6},
year = {1967},
pages = { 950-954},
language = {en},
url = {http://dml.mathdoc.fr/item/1183529117}
}
Gerstenhaber, Murray. The third cohomology group of a ring and the commutative cohomology theory. Bull. Amer. Math. Soc., Tome 73 (1967) no. 6, pp. 950-954. http://gdmltest.u-ga.fr/item/1183529117/