Yong Liu, Qingyuan Liu, Yuan Liu, Chi-Wang Shu & Mengping Zhang. (2019). Locally Divergence-Free Spectral-DG Methods for Ideal Magnetohydrodynamic Equations on Cylindrical Coordinates.
            <i>Communications in Computational Physics</i>. <i>26</i> (3).
            631-653.
         doi:10.4208/cicp.OA-2018-0187