Bai , Xixian and Rui , Hongxing. (2021). New Energy Analysis of Yee Scheme for Metamaterial Maxwell's Equations on Non-Uniform Rectangular Meshes.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>13</i> (6).
            1355-1383.
         doi:10.4208/aamm.OA-2020-0208