%0 Journal Article
%A M. Ratner
%T Invariant Measures and Orbit Closures for Unipotent Action on Homogeneous Spaces (Survey).
%J Geometric and functional analysis
%D 1994
%P 236-258
%V 4
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/GFA_1994__4_6_58162/
%F GFA_1994__4_6_58162