Podisuk, M., and C. Chaichuay. “Solving the Initial Value Problem of Higher-Order Ordinary Differential Equations by Polynomials”. CURRENT APPLIED SCIENCE AND TECHNOLOGY, vol. 5, no. 1, Nov. 2018, pp. 436-44, https://li01.tci-thaijo.org/index.php/cast/article/view/162493.