MathSciNet bibliographic data MR732696 (85k:46031) 46E35 (26B05 47B38) Calderón, Calixto P. Lacunary differentiability of functions in ${\bf R}\sp{n}$${\bf R}\sp{n}$. J. Approx. Theory 40 (1984), no. 2, 148–154. Article

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