@article{GDZPPN002057034, title = {Cohomology Operations derived from Cyclic Groups}, journal = {Commentarii mathematici Helvetici}, volume = {32}, year = {1957}, pages = {129-152}, zbl = {0090.39101}, url = {http://dml.mathdoc.fr/item/GDZPPN002057034} }
Steenrod, N.E., Thomas, Emery. Cohomology Operations derived from Cyclic Groups. Commentarii mathematici Helvetici, Tome 32 (1957) pp. 129-152. http://gdmltest.u-ga.fr/item/GDZPPN002057034/