Yuezheng Gong, Jiaxiang Cai and Yushun Wang. (2014). Multi-Symplectic Fourier Pseudospectral Method for the Kawahara Equation.
            <i>Communications in Computational Physics</i>. <i>16</i> (1).
            35-55.
         doi:10.4208/cicp.090313.041113a