L. Husein, Noora. “On The Solution of Existence of Nonlinear Integral-and Integrodifferential Equations”. Journal of Education and Science 27, no. 3 (June 1, 2018): 110–119. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/edusj/article/view/42299.