Elsayed M. E. Zayed & K. A. E. Alurrfi. (2019). A New Jacobi Elliptic Function Expansion Method for Solvinga Nonlinear PDE Describing Pulse Narrowing Nonlinear Transmission Lines.
            <i>Journal of Partial Differential Equations</i>. <i>28</i> (2).
            128-138.
         doi:10.4208/jpde.v28.n2.3