Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1956__31_139141, author = {N.E. Steenrod}, title = {Cohomology {Operations} {Derived} from the {Symmetric} {Group.}}, journal = {Commentarii mathematici Helvetici}, pages = {195--218}, publisher = {mathdoc}, volume = {31}, year = {1956}, zbl = {0077.16701}, url = {http://geodesic.mathdoc.fr/item/CMH_1956__31_139141/} }
N.E. Steenrod. Cohomology Operations Derived from the Symmetric Group.. Commentarii mathematici Helvetici, Tome 31 (1956), pp. 195-218. http://geodesic.mathdoc.fr/item/CMH_1956__31_139141/