Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1972_16_2_a2, author = {J. Tits}, title = {Free subgroups in linear groups}, journal = {Matematika}, pages = {47--66}, publisher = {mathdoc}, volume = {16}, number = {2}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1972_16_2_a2/} }
J. Tits. Free subgroups in linear groups. Matematika, Tome 16 (1972) no. 2, pp. 47-66. http://geodesic.mathdoc.fr/item/MAT_1972_16_2_a2/