Mingzhan Song,  Xu Qian,  Hong Zhang & Songhe Song. (2020). Hamiltonian Boundary Value Method for the Nonlinear Schrödinger Equation and the Korteweg-de Vries Equation.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>9</i> (4).
            868-886.
         doi:10.4208/aamm.2015.m1356