Shi , Dongyang and Zhang , Houchao. (2024). Convergence Analysis of Nonconforming Quadrilateral Finite Element Methods for Nonlinear Coupled Schrödinger-Helmholtz Equations.
            <i>Journal of Computational Mathematics</i>. <i>42</i> (4).
            979-998.
         doi:10.4208/jcm.2210-m2021-0337