Mengyue Wu, Jianhua Yuan & Jianxin Zhang. (2023). A Convex Approximation for a PDE Constrained Fractional Optimization Problem with an Application to Photonic Crystal Design.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>15</i> (6).
            1540-1561.
         doi:10.4208/aamm.OA-2022-0003