@article{GDZPPN002348209,
title = {A Secondary Product Structure in Cohomology Theory.},
journal = {Mathematica Scandinavica},
volume = {16},
year = {1965},
pages = {113-149},
zbl = {0148.43202},
url = {http://dml.mathdoc.fr/item/GDZPPN002348209}
}
Kock, Anders; Kristensen, Leif. A Secondary Product Structure in Cohomology Theory.. Mathematica Scandinavica, Tome 16 (1965) pp. 113-149. http://gdmltest.u-ga.fr/item/GDZPPN002348209/