MathSciNet bibliographic data MR2514338 (2011f:58020) 58C25 (26E10 41A05 41A29 46E15 65D05 65D10) Fefferman, Charles; Klartag, Bo'az Fitting a \$C\sp m\$$C\sp m$-smooth function to data. II. Rev. Mat. Iberoam. 25 (2009), no. 1, 49–273. Article

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