“Weighted Residual Method for the System of Nonlinear Volterra Integral Equations of the Second Kind Using an Exponential Function”. Ibn AL-Haitham Journal For Pure and Applied Sciences 34, no. 3 (August 1, 2021): 98–103. Accessed July 16, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/2682.