USMAN, M., T. ZUBAIR, I. RASHID, I. RASHID, A. YILDIRIM, and S. T. MOHYUD-DIN. “Modified Homotopy Analysis Method for Zakharov-Kuznetsov Equations”. Walailak Journal of Science and Technology (WJST), vol. 10, no. 5, July 2013, pp. 467-78, https://wjst.wu.ac.th/index.php/wjst/article/view/340.