M. Sabir, Ahmed, and أحمد. “Joint Numerical Range of Matrix Polynomials”. AL-Rafidain Journal of Computer Sciences and Mathematics 6, no. 2 (June 25, 2025): 129–136. Accessed August 5, 2025. https://rjps.uomosul.edu.iq/index.php/csmj/article/view/19356.