Xue Jiang, Linbo Zhang and Weiying Zheng. (2013). Adaptive <em>hp</em>-Finite Element Computations for Time-Harmonic Maxwell's Equations.
            <i>Communications in Computational Physics</i>. <i>13</i> (2).
            559-582.
         doi:10.4208/cicp.231111.090312a