Jie Ding, Cheng Wang and Shenggao Zhou. (2018). Optimal Rate Convergence Analysis of a Second Order Numerical Scheme for the Poisson-Nernst-Planck System.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>12</i> (2).
            607-626.
         doi:10.4208/nmtma.OA-2018-0058