Liu , Hailiang and Maimaitiyiming , Wumaier. (2020). Unconditional Positivity-Preserving and Energy Stable Schemes for a Reduced Poisson-Nernst-Planck System.
            <i>Communications in Computational Physics</i>. <i>27</i> (5).
            1505-1529.
         doi:10.4208/cicp.OA-2019-0063