%0 Journal Article %A M. V. Jakobson %T Invariant measures that are absolutely continuous in $ dx$ for one-parameter families of one-dimensional maps %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1980 %P 198-199 %V 35 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1980_35_4_a21/ %G en %F RM_1980_35_4_a21