Nabil, Tamer. “Solvability of Nonlinear Coupled System of Urysohn-Volterra Quadratic Integral Equations in Generalized Banach Algebras”. Journal of Fractional Calculus and Nonlinear Systems 5, no. 2 (December 31, 2024): 16–32. Accessed April 30, 2025. https://sabapub.com/index.php/jfcns/article/view/1192.