%0 Journal Article %A Ingegerd Palmér %T The global homological dimension of semi-trival extensions of rings. %J Mathematica Scandinavica %D 1975 %P 223-256 %V 37 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1975__37_166442/ %F MS2_1975__37_166442