no. 1
On the mean square value of Dirichlet’s L-functions
Compositio Mathematica, Tome 84 (1992) no. 1, pp. 59-69. 
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     author = {Wenpeng, Zhang},
     title = {On the mean square value of {Dirichlet{\textquoteright}s} $L$-functions},
     journal = {Compositio Mathematica},
     pages = {59--69},
     publisher = {Kluwer Academic Publishers},
     volume = {84},
     number = {1},
     year = {1992},
     mrnumber = {1183563},
     zbl = {0755.11027},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1992__84_1_59_0/}
}
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Wenpeng, Zhang. On the mean square value of Dirichlet’s $L$-functions. Compositio Mathematica, Tome 84 (1992) no. 1, pp. 59-69. http://archive.numdam.org/item/CM_1992__84_1_59_0/

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[4] Zhang Wenpeng, On the Hurwitz zeta-function. Acta Math. Sinica, 33 (1990), 160-171. | MR | Zbl

[5] R. Balasubramanian, A note on the Dirichlet L-functions. Acta Arith. (1980) XXXVIII, 273-283. | Zbl