“On Spectra of Symmetrized Two-Sided Multiplication Operators Implemented by Orthogonal Isometries ”, International Journal of Open Problems in Computer Science and Mathematics, vol. 18, no. 4, pp. 52–69, Sep. 2025, Accessed: Sep. 22, 2026. [Online]. Available: https://ijopcm.zuj.edu.jo/index.php/journal/article/view/40