Superconvergence Analysis of a BDF-Galerkin FEM for the Nonlinear Klein-Gordon-Schrödinger Equations with Damping Mechanism. JCM [Internet]. 2022 Nov. 15 [cited 2025 Dec. 5];41(2):224-45. Available from: https://www.global-sci.com/index.php/JCM/article/view/12525