%0 Journal Article %A Gerhard Knieper %A Howard Weiss %T Regularity of measure theoretic entropy for geodesic flows of negative curvature: I. %J Inventiones mathematicae %D 1989 %P 579-590 %V 95 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1989__95_3_143667/ %F IM_1989__95_3_143667