TY  - JOUR
AU  - M. Ratner
TI  - Invariant Measures and Orbit Closures for Unipotent Action on Homogeneous Spaces (Survey).
JO  - Geometric and functional analysis
PY  - 1994
SP  - 236
EP  - 258
VL  - 4
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/GFA_1994__4_6_58162/
ID  - GFA_1994__4_6_58162
ER  -