@article{10_4171_dm_95,
     author = {J\"org Winkelmann},
     title = {How frequent are discrete cyclic subgroups of semisimple {Lie} groups?},
     journal = {Documenta mathematica},
     pages = {29--35},
     year = {2001},
     volume = {6},
     doi = {10.4171/dm/95},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/95/}
}