@article{1077474679,
author = {Lyndon, Roger C.},
title = {The cohomology theory of group extensions},
journal = {Duke Math. J.},
volume = {15},
number = {1},
year = {1948},
pages = { 271-292},
language = {en},
url = {http://dml.mathdoc.fr/item/1077474679}
}
Lyndon, Roger C. The cohomology theory of group extensions. Duke Math. J., Tome 15 (1948) no. 1, pp. 271-292. http://gdmltest.u-ga.fr/item/1077474679/