Geodesic
A Short Remark on the Multiplicative Energy of the Spectrum
Matematičeskie zametki, Tome 105 (2019) no. 3, pp. 444-454.

Voir la notice de l'article provenant de la source Math-Net.Ru

An upper bound for the multiplicative energy of the spectrum of an arbitrary subset of $\mathbb F_p$ is obtained. Apparently, at present, this is the best bound.
Keywords: large exponential sum, multiplicative energy, sum-product phenomenon. 
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I. D. Shkredov. A Short Remark on the Multiplicative Energy of the Spectrum. Matematičeskie zametki, Tome 105 (2019) no. 3, pp. 444-454. http://geodesic.mathdoc.fr/item/MZM_2019_105_3_a11/

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