Tishchenko, S. V. “On One Class of Topological *-Algebras With Standard Identities”. Ukrains’kyi Matematychnyi Zhurnal 59, no. 1 (January 25, 2007): 140–143. Accessed March 21, 2023. https://umj.imath.kiev.ua/index.php/umj/article/view/3298.