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@article{MS2_1963__12_165835, author = {Leif Kristensen}, title = {On {Secondary} {Cohomology} {Operations.}}, journal = {Mathematica Scandinavica}, pages = {57--82}, publisher = {mathdoc}, volume = {12}, year = {1963}, zbl = {0118.18303}, url = {http://geodesic.mathdoc.fr/item/MS2_1963__12_165835/} }
Leif Kristensen. On Secondary Cohomology Operations.. Mathematica Scandinavica, Tome 12 (1963), pp. 57-82. http://geodesic.mathdoc.fr/item/MS2_1963__12_165835/