MathSciNet bibliographic data MR422955 (54 #10939) 41A15 Chui, Charles K.; Smith, Philip W.; Ward, Joseph D. On the smoothness of best \$L\sb{2}\$$L\sb{2}$ approximants from nonlinear spline manifolds. Math. Comp. 31 (1977), no. 137, 17–23. Article

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