Geodesic
Bounds for exponential sums modulo~$p^2$
Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 6, pp. 81-94.

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

In this paper we consider exponential sums over subgroups $G\subset\mathbb Z_q^*$. Using Stepanov's method, we obtain nontrivial bounds for exponential sums in the case, where $q$ is a square of a prime number. 
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Yu. V. Malykhin. Bounds for exponential sums modulo~$p^2$. Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 6, pp. 81-94. http://geodesic.mathdoc.fr/item/FPM_2005_11_6_a9/

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