Geodesic
Numerical study of natural superconvergence in least-squares finite element methods for elliptic problems
Applications of Mathematics, Tome 54 (2009) no. 3, pp. 251-266.

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Natural superconvergence of the least-squares finite element method is surveyed for the one- and two-dimensional Poisson equation. For two-dimensional problems, both the families of Lagrange elements and Raviart-Thomas elements have been considered on uniform triangular and rectangular meshes. Numerical experiments reveal that many superconvergence properties of the standard Galerkin method are preserved by the least-squares finite element method.
DOI : 10.1007/s10492-009-0016-6
Classification : 35J05, 65N12, 65N30
Keywords: least-squares finite element method; mixed finite element method; natural superconvergence; Raviart-Thomas element; Poisson equation; Lagrange elements; triangular and rectangular meshes; numerical experiments; Galerkin method 
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Lin, Runchang; Zhang, Zhimin. Numerical study of natural superconvergence in least-squares finite element methods for elliptic problems. Applications of Mathematics, Tome 54 (2009) no. 3, pp. 251-266. doi : 10.1007/s10492-009-0016-6. http://geodesic.mathdoc.fr/articles/10.1007/s10492-009-0016-6/

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