1. A. Borel, “On free subgroups of semisimple groups,” Enseign. Math., 29, 151–164 (1983).
2. A. Borel, Linear Algebraic Groups, 2nd ed., Springer-Verlag, New York (1991).
3. R. W. Carter, Simple Groups of Lie Type, John Wiley & Sons, London–New York–Sydney (1972).
4. R. W. Carter, Finite Groups of Lie Type. Conjugacy Classes and Complex Characters, John Wiley and Sons (1985).
5. N. L. Gordeev, “Freedom in conjugacy classes of simple algebraic groups and identities with constants,” St. Petersburg Math. J., 9, 709–723 (1998).