@article{01770074, title = {Secondary cohomology and the Steenrod square.}, journal = {Homology, Homotopy and Applications}, volume = {4}, year = {2002}, pages = {29-62}, zbl = {0996.55005}, language = {en}, url = {http://dml.mathdoc.fr/item/01770074} }
Baues, Hans-Joachim. Secondary cohomology and the Steenrod square.. Homology, Homotopy and Applications, Tome 4 (2002) pp. 29-62. http://gdmltest.u-ga.fr/item/01770074/