1. S.A. Amitsur, A generalization of Hilbert’s Nullstellensatz. Proc. Amer. Math. Soc. 8 (1957) 649–656.
2. S.A. Amitsur, Identities in rings with involutions, Israel J. Math. 7 (1969) 63–68.
3. K. I. Beidar, W. S. Martindale 3rd, A.V. Mikhalev, Rings with Generalized Identities, Marcel Dekker, Inc., 1996.
4. M. Brešar, I. Klep, Values of Noncommutative Polynomials, Lie Skew-Ideals and Tracial Nullstellensätze, Math. Res. Lett. 16 (2009) 605–626.
5. M. Brešar, I. Klep, A note on values of noncommutative polynomials, Proc. Am. Math. Soc. 138 (2010) 2375–2379.