Sabreen M. Abbas, Abbas Y. Al-Bayati, and Maysoon M. Aziz. “Applying New Preconditioned Conjugated Gradient Algorithms to Unconstrained Optimization Problems”. Bilangan : Jurnal Ilmiah Matematika, Kebumian dan Angkasa 3, no. 1 (January 9, 2025): 60–78. Accessed April 25, 2025. https://journal.arimsi.or.id/index.php/Bilangan/article/view/378.