@article{10_1090_S0894_0347_1994_1207014_8,
     author = {Zimmer, Robert J.},
     title = {Discrete groups and {non-Riemannian} homogeneous spaces},
     journal = {Journal of the American Mathematical Society},
     pages = {159--168},
     publisher = {mathdoc},
     volume = {07},
     number = {1},
     year = {1994},
     doi = {10.1090/S0894-0347-1994-1207014-8},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1994-1207014-8/}
}