Zayed , Elsayed M. E. and Alurrfi , K. A. E.. (2015). Exact Traveling Wave Solutions for Higher Order Nonlinear Schrödinger Equations in Optics by Using the (G'/G, 1/G)-expansion Method.
            <i>Journal of Partial Differential Equations</i>. <i>28</i> (4).
            332-357.
         doi:10.4208/jpde.v28.n4.4