Faghih-Ahmadi, M., and F. Gorjizadeh. “A-NUMERICAL RADIUS OF A-NORMAL OPERATORS IN SEMI-HILBERTIAN SPACES”. Italian Journal of Pure and Applied Mathematics 36 (July 29, 2016): 73–78. Accessed September 5, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/6654.