Fu , FangfangKong , Linghua and Wang , Lan. (2009). Symplectic Euler Method for Nonlinear High Order Schrödinger Equation with a Trapped Term.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>1</i> (5).
            699-710.
         doi:10.4208/aamm.09-m0929