1. K. I. Beidar, ?Semiprime rings with a generalized identity,? Usp. Mat. Nauk,32, No. 4, 249?250 (1977).
2. I. Z. Golubchik and A. V. Mikhalev, ?Generalized rational identities in division rings,? in: XV All-Union Algebra Conference, Abstracts of Reports, Part II, Krasnoyarsk (1979), p. 38.
3. J. Dieudonne, Geometry of the Classical Groups [Russian translation], Moscow (1974).
4. P. M. Cohn, Free Rings and Their Relations, Academic Press, London-New York (1971).
5. S. A. Amitsur, ?Rational identities and applications to algebra and geometry,? J. Algebra,3, No. 2, 304?359 (1966).