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Convergence in energy for elliptic operators. (English) Zbl 0347.65034
Proc. 3rd Symp. numer. Solut. partial Differ. Equat., College Park 1975, 469-498 (1976).

65J05 General theory of numerical analysis in abstract spaces
65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
35J25 Boundary value problems for second-order elliptic equations
35K20 Initial-boundary value problems for second-order parabolic equations