NikoufarI., and RassiasJ. M. “θ-Centralizers on Semiprime Banach *-Algebras”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 2 (February 25, 2014): 269–278. Accessed September 1, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2129.