Geodesic
On the Wiener norm of subsets of $\mathbb Z_p$ of medium size
Fundamentalʹnaâ i prikladnaâ matematika, Tome 19 (2014) no. 5, pp. 75-87.

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We give a lower bound for the Wiener norm of the characteristic function of a subset $A$ from $\mathbb Z_p$, where $p$ is a prime number, in the situation where $\exp((\log p/\log\log p)^{1/3})\le|A|\le p/3$. 
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S. V. Konyagin; I. D. Shkredov. On the Wiener norm of subsets of $\mathbb Z_p$ of medium size. Fundamentalʹnaâ i prikladnaâ matematika, Tome 19 (2014) no. 5, pp. 75-87. http://geodesic.mathdoc.fr/item/FPM_2014_19_5_a3/

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