Sabreen M. Abbas, Abbas Y. Al-Bayati and Maysoon M. Aziz (2025) “Applying New Preconditioned Conjugated Gradient Algorithms to Unconstrained Optimization Problems”, Bilangan : Jurnal Ilmiah Matematika, Kebumian dan Angkasa, 3(1), pp. 60–78. doi: 10.62383/bilangan.v3i1.378.