El-Zahar, Essam R., and Abdelhalim Ebaid. “ON COMPUTING DIFFERENTIAL TRANSFORM OF NONLINEAR NON-AUTONOMOUS FUNCTIONS AND ITS APPLICATIONS”. Italian Journal of Pure and Applied Mathematics 40 (July 31, 2018): 711–723. Accessed October 7, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/6967.