@article{GDZPPN002358573,
title = {Product structures in pyramids of higher order cohomology operations.},
journal = {Mathematica Scandinavica},
volume = {56},
year = {1985},
pages = {155-170},
zbl = {0562.55019},
url = {http://dml.mathdoc.fr/item/GDZPPN002358573}
}
Holtzman, D.N. Product structures in pyramids of higher order cohomology operations.. Mathematica Scandinavica, Tome 56 (1985) pp. 155-170. http://gdmltest.u-ga.fr/item/GDZPPN002358573/