@article{GDZPPN002056941,
title = {Cohomology Operations Derived from the Symmetric Group.},
journal = {Commentarii mathematici Helvetici},
volume = {30},
year = {1956},
pages = {195-218},
zbl = {0077.16701},
url = {http://dml.mathdoc.fr/item/GDZPPN002056941}
}
Steenrod, N.E. Cohomology Operations Derived from the Symmetric Group.. Commentarii mathematici Helvetici, Tome 30 (1956) pp. 195-218. http://gdmltest.u-ga.fr/item/GDZPPN002056941/