Cui , MingLi , Yanfei and Yao , Changhui. (2023). Unconditional Superconvergence Analysis of Energy Conserving Finite Element Methods for the Nonlinear Coupled Klein-Gordon Equations.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>15</i> (3).
            602-622.
         doi:10.4208/aamm.OA-2021-0261