Michael A. Obe, Godspower C. Abanum, & Innocent C. Eli. (2018). Variational Iteration Method for First and Second Order Ordinary Differential Equations using First Kind Chebychev Polynomials. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE, 4(8), 126–131. https://doi.org/10.31695/IJASRE.2018.32829