Mustafa Mamat, Mouiyad Bani Yousef, Ibrahim Mohammed Sulaiman, Mohd Rivaie. 2020. “A New Modification of Fletcher-Reeves Conjugate Gradient Method for Unconstrained Optimization Models”. International Journal of Advanced Science and Technology 29 (7), 1723 -33. http://sersc.org/journals/index.php/IJAST/article/view/16256.