Luo , Tingjian and Wang , Zhengping. (2012). Nodal Type Bound States for Nonlinear Schrödinger Equations with Decaying Potentials.
            <i>Journal of Partial Differential Equations</i>. <i>25</i> (1).
            79-89.
         doi:10.4208/jpde.v25.n1.6