SamoilenkoYu. S., and YakymenkoD. Yu. “Scalar Operators Equal to the Product of Unitary Roots of the Identity Operator”. Ukrains’kyi Matematychnyi Zhurnal 64, no. 6 (June 25, 2012): 819-825. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2619.