@article{CMH_1985__60_140002,
     author = {Gopal Prasad and M.S. Raghunathan},
     title = {On the {Kneser-Tits} problem.},
     journal = {Commentarii mathematici Helvetici},
     pages = {107--121},
     publisher = {mathdoc},
     volume = {60},
     year = {1985},
     zbl = {0574.20033},
     url = {http://geodesic.mathdoc.fr/item/CMH_1985__60_140002/}
}