@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/}
}