Samoilenko YS, Yakymenko DY. Scalar operators equal to the product of unitary roots of the identity operator. Ukr. Mat. Zhurn. [Internet]. 2012 Jun. 25 [cited 2025 Dec. 5];64(6):819-25. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2619