MathSciNet bibliographic data MR447889 (56 #6199) 41A15 Barrow, D. L.; Chui, C. K.; Smith, P. W.; Ward, J. D. Unicity of best \$L\sb{2}\$$L\sb{2}$ approximation by second-order splines with variable knots. Bull. Amer. Math. Soc. 83 (1977), no. 5, 1049–1050. Article

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