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2018. Nodal $\mathcal{O}(h^4)$-Superconvergence in 3D by Averaging Piecewise Linear, Bilinear, and Trilinear FE Approximations. Journal of Computational Mathematics. 28, 1 (Aug. 2018), 1–10. DOI:https://doi.org/10.4208/jcm.2009.09-m1004.