Ziqing Xie, Jiangxing Wang, Bo Wang and Chuanmiao Chen. (2018). Solving Maxwell's Equation in Meta-Materials by a CG-DG Method.
            <i>Communications in Computational Physics</i>. <i>19</i> (5).
            1242-1264.
         doi:10.4208/cicp.scpde14.35s