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3. Spline approximation by quasiinterpolants;de Boor;J. Approx. Theory,1973
4. Projection methods for Dirichlet's problem in approximating polygonal domains with boundary value corrections;Bramble;Math. Comp.,1972
5. Bounds for a class of linear functionals with application to Hermite interpolation;Bramble;Numer. Math.,1971