@article{MS2_1965__17_165929,
     author = {Anders Kock and Leif Kristensen},
     title = {A {Secondary} {Product} {Structure} in {Cohomology} {Theory.}},
     journal = {Mathematica Scandinavica},
     pages = {113--149},
     publisher = {mathdoc},
     volume = {17},
     year = {1965},
     zbl = {0148.43202},
     url = {http://geodesic.mathdoc.fr/item/MS2_1965__17_165929/}
}