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@article{MS2_1985__57_166946, author = {D.N. Holtzman}, title = {Product structures in pyramids of higher order cohomology operations.}, journal = {Mathematica Scandinavica}, pages = {155--170}, publisher = {mathdoc}, volume = {57}, year = {1985}, zbl = {0562.55019}, url = {http://geodesic.mathdoc.fr/item/MS2_1985__57_166946/} }
D.N. Holtzman. Product structures in pyramids of higher order cohomology operations.. Mathematica Scandinavica, Tome 57 (1985), pp. 155-170. http://geodesic.mathdoc.fr/item/MS2_1985__57_166946/