MathSciNet bibliographic data MR2480607 (2011g:58011) 58C25 (26B05 65D10) Fefferman, Charles; Klartag, Bo'az Fitting a \$C\sp m\$$C\sp m$-smooth function to data. I. Ann. of Math. (2) 169 (2009), no. 1, 315–346. Article

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