@article{RM_1994_49_2_a20,
     author = {A. N. Starkov},
     title = {Invariant sets of homogeneous flows and {Ratner's} theorem},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {178--179},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1994_49_2_a20/}
}