@article{01582841, title = {How frequent are discrete cyclic subgroups of semisimple Lie groups?}, journal = {Documenta Mathematica}, volume = {6}, year = {2001}, pages = {29-35}, zbl = {0965.22013}, language = {en}, url = {http://dml.mathdoc.fr/item/01582841} }
Winkelmann, Jörg. How frequent are discrete cyclic subgroups of semisimple Lie groups?. Documenta Mathematica, Tome 6 (2001) pp. 29-35. http://gdmltest.u-ga.fr/item/01582841/