1. E. Albas, On τ-centralizers of semiprime rings, Sib. Math. J., 48(2) (2007), 191–196.
2. M. N. Daif and M. S. Tammam El-Sayiad, On centralizers of semiprime rings (II), St. Petersburg Math. J., 21(1) (2010), 43–52.
3. H. Gahramani, On centralizers of Banach algebras, Bull. Malays. Math. Sci. Soc., 38(1) (2015), 155–164.
4. J. Vukman, An identity related to centralizers in semiprime rings, Comment. Math. Univ. Carolin., 40 (1999), 447–456.
5. J. Vukman, Centralizers on semiprime rings, Comment. Math. Univ. Carolin., 42(2) (2001), 237–245.
6. B. Zalar, On centralizers of semiprime rings, Comment. Math. Univ. Carolin., 32(4) (1991), 609–614.