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Identities for piecewise polynomial spaces determinated by connection matrices. N. Dyn; R.N. Goldman; Philip J. Barry — 1991 Aequationes mathematicae
Conditions for regular B -spline curves and surfaces N. Dyn; D. Levin; I. Yad-Shalom — 1992 ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique