O. Davydov and L. L. Schumaker, Locally linearly independent bases for bivariate polynomial spline spaces, Advances in Comp. Math.13 (2000), 355-373.

Abstract: Locally linearly independent bases are constructed for the spaces $S^r_d(\Delta)$ of polynomial splines of degree $d\ge 3r+2$ and smoothness $r$ defined on triangulations, as well as for their superspline subspaces.

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