@article{JRAM_1978__298_151965,
     author = {G. Harder and A. Borel},
     title = {Existence of discrete cocompact subgroups of reductive groups over local fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {53--64},
     publisher = {mathdoc},
     volume = {298},
     year = {1978},
     zbl = {0385.14014},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__298_151965/}
}