HASSAN, H. N., and M. S. SEMARY. “An Analytic Solution to a Parameterized Problems Arising in Heat Transfer Equations by Optimal Homotopy Analysis Method”. Walailak Journal of Science and Technology (WJST), vol. 11, no. 8, Dec. 2013, pp. 659-77, https://wjst.wu.ac.th/index.php/wjst/article/view/490.