Geodesic
On representation of piecewise-smooth functions by rapidly convergent trigonometric series
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 2 (1999) no. 4, pp. 385-394.

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A specific variant of expansions of smooth and piecewise-smooth functions to rapidly convergent series with respect to trigonometric functions is suggested. This result is the basis for the effective approximations of the above-mentioned functions. 
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V. V. Smelov. On representation of piecewise-smooth functions by rapidly convergent trigonometric series. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 2 (1999) no. 4, pp. 385-394. http://geodesic.mathdoc.fr/item/SJVM_1999_2_4_a7/

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