@article{GDZPPN00219452X,
title = {Existence of discrete cocompact subgroups of reductive groups over local fields.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {302},
year = {1978},
pages = {53-64},
zbl = {0385.14014},
url = {http://dml.mathdoc.fr/item/GDZPPN00219452X}
}
Harder, G.; Borel, A. Existence of discrete cocompact subgroups of reductive groups over local fields.. Journal für die reine und angewandte Mathematik, Tome 302 (1978) pp. 53-64. http://gdmltest.u-ga.fr/item/GDZPPN00219452X/