Anakira, N. R., Jameel, A., Alomari, A.-K., Saaban, A., Almahameed, M., & Hashim, I. (2018). Approximate Solutions of Multi-Pantograph Type Delay Differential Equations Using Multistage Optimal Homotopy Asymptotic Method. Journal of Mathematical and Fundamental Sciences, 50(3), 221-232. https://doi.org/10.5614/j.math.fund.sci.2018.50.3.1