Wenqiang Xiao, Bo Gong, Junshan Lin & Jiguang Sun. (2023). Band Structure Calculations of Dispersive Photonic Crystals in 3D Using Holomorphic Operator Functions.
            <i>Communications in Computational Physics</i>. <i>33</i> (2).
            628-646.
         doi:10.4208/cicp.OA-2022-0233