@article{MS2_1983__53_166865,
     author = {Thomas Weibull},
     title = {A natural map from the ext {K\"unneth} sequence to the {Tor} one.},
     journal = {Mathematica Scandinavica},
     pages = {203--206},
     publisher = {mathdoc},
     volume = {53},
     year = {1983},
     zbl = {0547.18005},
     url = {http://geodesic.mathdoc.fr/item/MS2_1983__53_166865/}
}