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Cited article:

Ultraconvergence of finite element method by Richardson extrapolation for elliptic problems with inhomogeneous boundary conditions

Wen‐ming He, Ren Zhao and Yong Cao
Numerical Methods for Partial Differential Equations 38 (1) 33 (2022)
https://doi.org/10.1002/num.22822

Approximation of the eigenvalues of a fourth order differential equation with non-smooth coefficients

Uday Banerjee
BIT 31 (4) 620 (1991)
https://doi.org/10.1007/BF01933177