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Discrete Math."],"published-print":{"date-parts":[[2021,1]]},"abstract":"<jats:p>We obtain new bounds of exponential sums modulo a prime $p$ with sparse polynomials $a_0x^{n_0} + \\cdots + a_{\\nu}x^{n_\\nu}$. The bounds depend on various greatest common divisors of exponents $n_0, \\ldots, n_\\nu$ and their differences. 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