[1] Bramble, J.H. and Schatz, A.H. (1977) Higher Order Local Accuracy by Averaging in the Finite Element Method. Mathematics of Computation, 31, 94-111.
https://doi.org/10.1090/S0025-5718-1977-0431744-9
[2] Douglas Jr., J. and Wang, J. (1989) A Superconvergence for Mixed Finite Element Methods on Rectangular Domains. Calcolo, 26, 121-134.
https://doi.org/10.1007/BF02575724
[3] Ewing, R.E., Lazarov, R. and Wang, J. (1991) Superconvergence of the Velocity along the Gauss Lines in Mixed Finite Element Methods. SIAM Journal on Numerical Analysis, 28, 1015-1029.
https://doi.org/10.1137/0728054
[4] Krizek, M. and Neittaanmaki, P. (1984) Superconvergence Phenomenon in the Finite Element Method Arising from Averaging Gradient. Numerische Mathematik, 45, 105-116.
https://doi.org/10.1007/BF01379664
[5] Lazarov, R., Andreev, A.B. and Hatri, M. (1984) Superconvergence of the Gradients in the Finite Element Method for Some Elliptic and Parabolic Problems. In: Variational-Difference Methods in Mathematical Physics, Part II, Moscow, 13-25.
[6] Lin, Q. (1992) Global Error Expansion and Superconvergence for Higher Order Interpolation of Finite Element. Journal of Computational Mathematics, 10, 286-289.
[7] Oganesyan, I.A. and Rukhovetz, L.A. (1969) Study of the Rate of Convergence of Variational Difference Scheme for Second-Order Elliptic Equations in Two-Dimensional Field with a Smooth Boundary. USSR Computational Mathematics and Mathematical Physics, 9, 158-183.
https://doi.org/10.1016/0041-5553(69)90159-1
[8] Wahlbin, L.B. (1995) Superconvergence in Galerkin Finite Element Methods. Springer, New York.
https://doi.org/10.1007/BFb0096835
[9] Zlamal, M. (1978) Superconvergence and Reduced Integration in the Finite Element Method. Mathematics of Computation, 32, 663-685.
https://doi.org/10.2307/2006479
[10] Schatz, A.H., Sloan, I.H. and Wahlbin, L.B. (1996) Superconvergence in Finite Element Methods and Meshes That Are Symmetric with Respect to a Point. SIAM Journal on Numerical Analysis, 33, 505-521.
https://doi.org/10.1137/0733027
[11] Douglas, J., Dupont, T. and Wheeler, M.F. (1974) An Estimate and a Superconvergence Result for a Galerkin Method for Elliptic Equations Based on Tensor Products of Piecewise Polynomials. RAIRO: Analyse Numérique, 8, 61-66.
[12] Douglas, J. and Dupont, T. (1973) Some Superconvergence Results for Galerkin Methods for the Approximation Solution of Two-Point Boundary Value Problems. Topics in Numerical Analysis, 89-92.
[13] Wang, J. (1991) Superconvergence and Extrapolation for Mixed Finite Element Methods on Rectangular Domains. Mathematics of Computation, 56, 477-503.
https://doi.org/10.1090/S0025-5718-1991-1068807-0
[14] Zienkiewicz, O.C. and Zhu, J.Z. (1992) The Superconvergent Patch Recovery and a Posteriori Error Estimates. Parts 1: The Recovery Technique. International Journal for Numerical Methods in Engineering, 33, 1331-1364.
https://doi.org/10.1002/nme.1620330702
[15] Zienkiewicz, O.C. and Zhu, J.Z. (1992) The Superconvergent Patch Recovery and a Posteriori Error Estimates. Parts 2: Error Estimates and Adaptivity. International Journal for Numerical Methods in Engineering, 33, 1365-1382.
https://doi.org/10.1002/nme.1620330703
[16] Wang, J. (2000) A Superconvergence Analysis for Finite Element Solutions by the Least-Square Surface Fitting on Irregular Meshes for Smooth Problems. Journal of Mathematical Study, 33, 229-243.
[17] Ciarlet, P.G. (1978) The Finite Element Method for Elliptic Problems. Elsevier, New York.