A problem of D. H. Lehmer and its generalization (II)
Compositio Mathematica, Volume 91 (1994) no. 1, p. 47-56 
@article{CM_1994__91_1_47_0,
     author = {Wenpeng, Zhang},
     title = {A problem of D. H. Lehmer and its generalization (II)},
     journal = {Compositio Mathematica},
     publisher = {Kluwer Academic Publishers},
     volume = {91},
     number = {1},
     year = {1994},
     pages = {47-56},
     zbl = {0798.11001},
     mrnumber = {1273925},
     language = {en},
     url = {http://www.numdam.org/item/CM_1994__91_1_47_0}
}

Wenpeng, Zhang. A problem of D. H. Lehmer and its generalization (II). Compositio Mathematica, Volume 91 (1994) no. 1, pp. 47-56. http://www.numdam.org/item/CM_1994__91_1_47_0/

[1] Richard K. Guy, Unsolved Problems in Number Theory, Springer-Verlag, 1981, pp. 139-140. | MR 656313 | Zbl 0805.11001

[2] Zhang Wenpeng, On a problem of D. H. Lehmer and its generalization, Compositio Mathematica. 86 (1993) 307-316. | Numdam | MR 1219630 | Zbl 0783.11002

[3] Funakura, Takeo, On Kronecker's limit formula for Dirichlet series with periodic coefficients, Acta Arith., 55 (1990), No. 1, pp. 59-73. | MR 1056115 | Zbl 0654.10039

[4] T. Estermann, On Kloostermann's sum, Mathematica, 8 (1961), pp. 83-86. | MR 126420 | Zbl 0114.26302

[5] Apostol, Tom M, Introduction to Analytic Number Theory, Springer-Verlag, New York, 1976. | MR 434929 | Zbl 0335.10001

[6] J.-M. Deshouillers and H. Iwaniec, Kloosterman Sums and Fourier coefficients of Cusp Forms, Inventiones Mathematicae, 70 (1982) pp. 219-288. | MR 684172 | Zbl 0502.10021