Iman Bahreyni, Rahmat Soltani, Fariba Ershad. “On Preserver Mappings of Spectrum and Spectral Radius of Linear Operators in Banach Spaces”. The International Journal of Multiphysics 18, no. 4 (December 27, 2024): 761 - 770. Accessed February 7, 2026. https://mail.themultiphysicsjournal.com/index.php/ijm/article/view/1618.