%0 Journal Article %A Tomasz Nowicki %A Sebastian van Strien %T Invariant measures exist under a summability condition for unimodal maps. %J Inventiones mathematicae %D 1991 %P 123-136 %V 105 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1991__105_3_143905/ %F IM_1991__105_3_143905