MathSciNet bibliographic data MR687634 (84j:41014) 41A15 (41A25 41A63) de Boor, C.; Höllig, K. Approximation order from bivariate \$C\sp{1}\$$C\sp{1}$-cubics: a counterexample. Proc. Amer. Math. Soc. 87 (1983), no. 4, 649–655. Article

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