Geodesic
An extremal problem for even positive definite entire functions of exponential type
Matematičeskie zametki, Tome 80 (2006) no. 5, pp. 712-717.

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We consider an extremal problem for even positive definite entire functions of exponential type with zero mean with power weight on the semiaxis. This problem is related to the multidimensional Jackson–Stechkin theorem in the space $L_{2}(\mathbb R^{n})$. 
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D. V. Gorbachev; S. A. Strankovskii. An extremal problem for even positive definite entire functions of exponential type. Matematičeskie zametki, Tome 80 (2006) no. 5, pp. 712-717. http://geodesic.mathdoc.fr/item/MZM_2006_80_5_a6/

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