MathSciNet bibliographic data MR889554 (88e:41025) 41A15 (41A63) Alfeld, Peter; Schumaker, L. L. The dimension of bivariate spline spaces of smoothness \$r\$$r$ for degree \$d\geq 4r+1\$$d\geq 4r+1$. Constr. Approx. 3 (1987), no. 2, 189–197. Article

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