Sub-Optimal Convergence of Discontinuous Galerkin Methods with Central Fluxes for Linear Hyperbolic Equations with Even Degree Polynomial Approximations. JCM [Internet]. 2021 Jul. 5 [cited 2025 Dec. 6];39(4):518-37. Available from: https://global-sci.com/index.php/JCM/article/view/12468