ROSHID, H. O., M. N. ALAM, and M. A. AKBAR. “Traveling Wave Solutions for Fifth Order (1+1)-Dimensional Kaup-Keperschmidt Equation With the Help of Exp(-Phi)-Expansion Method”. Walailak Journal of Science and Technology (WJST), vol. 12, no. 11, Jan. 2015, pp. 1063-7, https://wjst.wu.ac.th/index.php/wjst/article/view/963.