Anakira, Nidal Ratib, Ali Jameel, Abedel-Karrem Alomari, Azizan Saaban, Mohammad Almahameed, and Ishak Hashim. “Approximate Solutions of Multi-Pantograph Type Delay Differential Equations Using Multistage Optimal Homotopy Asymptotic Method”. Journal of Mathematical and Fundamental Sciences 50, no. 3 (December 21, 2018): 221-232. Accessed November 2, 2025. https://journals.itb.ac.id/index.php/jmfs/article/view/6389.