TishchenkoS. V. “On One Class of Matrix Topological *-Algebras”. Ukrains’kyi Matematychnyi Zhurnal 53, no. 10 (October 25, 2001): 1436-1439. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4363.