Geodesic
On~the~distribution in the~arithmetic progressions of reducible quadratic polynomials
Izvestiya. Mathematics , Tome 45 (1995) no. 1, pp. 215-228

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By using Weil's estimate for Kloosterman sums, we obtain a result about the distribution of the sequence $n(n+2)$, beyond the classical level, when a bilinear form with support over pairs of prime moduli is considered. We also obtain an analogous result in the case of a trilinear form, but only by using the recent results for sums of Kloosterman sums of Deshouillers–Iwaniec. Furthermore the method is extended to consider general quadratic reducible polynomials. 
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S. Salerno; A. Vitolo. On~the~distribution in the~arithmetic progressions of reducible quadratic polynomials. Izvestiya. Mathematics , Tome 45 (1995) no. 1, pp. 215-228. http://geodesic.mathdoc.fr/item/IM2_1995_45_1_a11/