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Splines minimizing rotation-invariant semi-norms in Sobolev spaces. (English) Zbl 0342.41012
Constr. Theory Funct. several Variables, Proc. Conf. Oberwolfach 1976, Lect. Notes Math. 571, 85-100 (1977).

41A15 Spline approximation
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)