Geodesic
Extremum problems for functions with small support
Matematičeskie zametki, Tome 60 (1996) no. 3, pp. 323-332.

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In this paper we consider an extremum problem for even periodic functions having small intervals as their supports and subject to restrictions on the sum of the absolute values of their Fourier coefficients. 
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N. N. Andreev; S. V. Konyagin; A. Yu. Popov. Extremum problems for functions with small support. Matematičeskie zametki, Tome 60 (1996) no. 3, pp. 323-332. http://geodesic.mathdoc.fr/item/MZM_1996_60_3_a0/

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