TY - JOUR AU - M. V. Jakobson TI - Invariant measures that are absolutely continuous in $ dx$ for one-parameter families of one-dimensional maps JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1980 SP - 198 EP - 199 VL - 35 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1980_35_4_a21/ LA - en ID - RM_1980_35_4_a21 ER -