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@article{JLT_2000_10_1_a10, author = {G. A. Margulis and E. B. Vinberg}, title = {Some {Linear} {Groups} {Virtually} {Having} a {Free} {Quotient}}, journal = {Journal of Lie theory}, pages = {171--18}, publisher = {mathdoc}, volume = {10}, number = {1}, year = {2000}, url = {http://geodesic.mathdoc.fr/item/JLT_2000_10_1_a10/} }
G. A. Margulis; E. B. Vinberg. Some Linear Groups Virtually Having a Free Quotient. Journal of Lie theory, Tome 10 (2000) no. 1, pp. 171-18. http://geodesic.mathdoc.fr/item/JLT_2000_10_1_a10/