This paper introduces a general technique for estimating the absolute value of pure Gaussian sums of order k over a prime p for a class of composite order k. The new estimate improves the classical estimate by a factor of about 2 or better (depending on k) for all sufficiently large primes p.
Bounds On Exponential Sums With Quadrinomials
On exponential sums over orbits in $\mathbb{F}_p^d$
A generalization of Gallagher's lemma for exponential sums
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