@article{IM_1986__83_143320,
     author = {Robert J. Zimmer},
     title = {On the automorphism group of a compact {Lorentz} manifold and other geometric.},
     journal = {Inventiones mathematicae},
     pages = {411--424},
     publisher = {mathdoc},
     volume = {83},
     year = {1986},
     zbl = {0591.53026},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__83_143320/}
}