%0 Journal Article %A D. Ramachandran %A M. Misiurewicz %T Hopf's theorem on invariant measures for a group of transformations %J Studia Mathematica %D 1982 %P 183-189 %V 74 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-74-2-183-189/ %R 10.4064/sm-74-2-183-189 %G en %F 10_4064_sm_74_2_183_189