S. V. Tishchenko, “On one class of topological *-algebras with standard identities”, Ukr. Mat. Zhurn., vol. 59, no. 1, pp. 140–143, Jan. 2007, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3298