Yong Bo Zhai, Xue Wei Ping, Wei Xiang Jiang & Tie Jun Cui. (2020). Finite-Element Analysis of Three-Dimensional Axisymmetrical Invisibility Cloaks and Other Metamaterial Devices.
            <i>Communications in Computational Physics</i>. <i>8</i> (4).
            823-834.
         doi:10.4208/cicp.091009.080210a