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A hybrid IFR-IDY conjugate gradient algorithm for unconstrained optimization and its application in portfolio selection. J. Nig. Soc. Phys. Sci. [Internet]. 2026 Feb. 16 [cited 2026 Apr. 29];8(1):3105. Available from: https://journal.nsps.org.ng/index.php/jnsps/article/view/3105