Y. AL-Bayati, A., K. Abbo, K. and J. S, A. 2010. Generalized CG-algorithms Based on Rational Sigmoid Model for Unconstrained Optimization. IRAQI JOURNAL OF STATISTICAL SCIENCES. 10, 1 (Jun. 2010), 123–136. DOI:https://doi.org/10.33899/iqjoss.2010.030495.