ALTAHER, AHSAN; HAMEEDA ODA AL-HUMEDI. A Combination of the Orthogonal Polynomials with Least – Squares Method for Solving High-Orders Fredholm-Volterra Integro-Differential Equations. Al-Qadisiyah Journal of Pure Science, v. 26, n. 1, p. Math 20-38, 30 Nov. 2020.