no. 3
An application of Kloosterman sums
Compositio Mathematica, Tome 96 (1995) no. 3, pp. 323-330. 
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     number = {3},
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     url = {http://www.numdam.org/item/CM_1995__96_3_323_0/}
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Ruzsa, Imre Z.; Schinzel, Andrzej. An application of Kloosterman sums. Compositio Mathematica, Tome 96 (1995) no. 3, pp. 323-330. http://www.numdam.org/item/CM_1995__96_3_323_0/

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3 Malyshev, A.V.: A generalization of Kloosterman sums and their estimates (in Russian), Vestnik Leningrad. Univ. 15 (1960) No. 13, vypusk 3, 59-75. | MR | Zbl

4 Terjanian, G.: Letter to A. Schinzel of February 15, 1993.

5 Wenpeng, Zhang: On a problem of D. M. Lehmer and its generalization, Compositio Math. 86 (1993) 307-316. | Numdam | MR | Zbl