Ghasvareh, M., and M. E. Omidvar. “On Some Numerical Radius Inequalities for Hilbert Space Operators”. Methods of Functional Analysis and Topology 27, no. 2 (June 25, 2021): 192–197. Accessed February 4, 2026. https://zen.imath.kiev.ua/index.php/mfat/article/view/794.