Rabanovych, V. I. and Samoilenko, Y. S. (2001) “Scalar Operators Representable as a Sum of Projectors”, Ukrains’kyi Matematychnyi Zhurnal, 53(7), pp. 939-952. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4315 (Accessed: 19May2024).