MathSciNet bibliographic data MR2521121 (2011e:58014) 58C25 (41A29 46E15 65D10 65D15) Fefferman, Charles Fitting a \$C\sp m\$$C\sp m$-smooth function to data. III. Ann. of Math. (2) 170 (2009), no. 1, 427–441. Article

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