Geodesic
Norm Kloosterman sums over $\mathbb Z[i]$
Algebra and discrete mathematics, Tome 11 (2011) no. 2, pp. 82-91.

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$n$-dimensional norm Kloosterman sums over the ring of the Gaussian numbers investigate. Nontrivial estimates of these sums were obtained.
Keywords: Kloosterman sum, Gaussian numbers. 
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O. Savastru; S. Varbanets. Norm Kloosterman sums over $\mathbb Z[i]$. Algebra and discrete mathematics, Tome 11 (2011) no. 2, pp. 82-91. http://geodesic.mathdoc.fr/item/ADM_2011_11_2_a5/

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