1. O. Zariski and P. Samuel, University series in higher mathematics, Princeton (1958).
2. M. I. Kargapolov, “On finitely generated linear groups,” Algebra i Logika,5, No. 6, 17–20 (1967).
3. P. Hall, “On the finiteness of certain soluble groups,” Proc. London Math. Soc., 3rd series,9, No. 36, 595–622 (1959).
4. N. Jacobson, Structure of Rings, American Math. Soc. Colloquium Publications, Vol. 37, Providence R. I. (1956).
5. Yu. I. Merzlyakov, “Verbal and marginal subgroups of linear groups,” Dokl. Akad. Nauk SSSR,177, No. 5, 1008–1011 (1967).