no. 1
On the average of inversion of Dirichlet’s L-functions
Compositio Mathematica, Tome 84 (1992) no. 1, pp. 53-57. 
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     author = {Wenpeng, Zhang},
     title = {On the average of inversion of {Dirichlet{\textquoteright}s} $L$-functions},
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     pages = {53--57},
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     volume = {84},
     number = {1},
     year = {1992},
     mrnumber = {1183562},
     zbl = {0753.11029},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1992__84_1_53_0/}
}
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Wenpeng, Zhang. On the average of inversion of Dirichlet’s $L$-functions. Compositio Mathematica, Tome 84 (1992) no. 1, pp. 53-57. http://archive.numdam.org/item/CM_1992__84_1_53_0/

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

[3] Zhang Wenpeng, On the fourth power mean of Dirichlet L-functions, Chinese Science Bulletin, Vol. 35 (1990), No. 23, pp. 1940-1945. | Zbl