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Interpolation and approximation by piecewise quadratic $$C^1$$-functions of two variables. (English) Zbl 0424.41020
Multivariate approximation theory, Proc. Conf. math. Res. Inst., Oberwolfach 1979, ISNM Vol. 51, 146-161 (1979).

##### MSC:
 41A30 Approximation by other special function classes 41A05 Interpolation in approximation theory 51N10 Affine analytic geometry