@article{1077474141, author = {Eilenberg, Samuel and Mac Lane, Saunders}, title = {Algebraic cohomology groups and loops}, journal = {Duke Math. J.}, volume = {14}, number = {1}, year = {1947}, pages = { 435-463}, language = {en}, url = {http://dml.mathdoc.fr/item/1077474141} }
Eilenberg, Samuel; Mac Lane, Saunders. Algebraic cohomology groups and loops. Duke Math. J., Tome 14 (1947) no. 1, pp. 435-463. http://gdmltest.u-ga.fr/item/1077474141/