Saleh Balasim, Mohammad. “The Inverse of Operator Matrix A Where A≥I and A”. Journal of Al-Qadisiyah for Computer Science and Mathematics 3, no. 2 (October 1, 2017): 209–221. Accessed December 21, 2024. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/290.