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Computer-based proof of the existence of superconvergence points in the finite element method; superconvergence of the derivatives in finite element solutions of Laplace's, Poisson's, and the elasticity equations
I. Babuška, T. Strouboulis, C. S. Upadhyay and S. K. Gangaraj Numerical Methods for Partial Differential Equations 12(3) 347 (1996) https://doi.org/10.1002/num.1690120303
η%-Superconvergence of finite element approximations in the interior of general meshes of triangles
η%-Superconvergence in the interior of locally refined meshes of quadrilaterals: superconvergence of the gradient in finite element solutions of Laplace's and Poisson's equations