@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/