%0 Journal Article %A Thomas Weibull %T A natural map from the ext Künneth sequence to the Tor one. %J Mathematica Scandinavica %D 1983 %P 203-206 %V 53 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1983__53_166865/ %F MS2_1983__53_166865