Nonabelian free subgroups in homomorphic images of valued quaternion division algebras
Nonabelian free subgroups in homomorphic images of valued quaternion division algebras
Rapinchuk A, Rowen L, Segev Y. Nonabelian free subgroups in homomorphic images of valued quaternion division algebras. Proceedings of the Amer. Math. Soc. 2006;134(11):3107–3114.