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@article{JRAM_1966__224_150763, author = {Arnold Borel}, title = {Density and maximality of arithmetic subgroups.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {78--89}, publisher = {mathdoc}, volume = {224}, year = {1966}, zbl = {0158.03105}, url = {http://geodesic.mathdoc.fr/item/JRAM_1966__224_150763/} }
Arnold Borel. Density and maximality of arithmetic subgroups.. Journal für die reine und angewandte Mathematik, Tome 224 (1966), pp. 78-89. http://geodesic.mathdoc.fr/item/JRAM_1966__224_150763/