Hassan Fahs. (2009). High-Order Leap-Frog Based Discontinuous Galerkin Method for the Time-Domain Maxwell Equations on Non-Conforming Simplicial Meshes.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>2</i> (3).
            275-300.
         doi:10.4208/nmtma.2009.m8018