MathSciNet bibliographic data MR2217323 (2007a:11122) 11M06 (11B68 11F20) Liu, Huaning; Zhang, Wenpeng On the mean value of $L(m,\chi)L(n,\overline\chi)$$L(m,\chi)L(n,\overline\chi)$ at positive integers $m,n\geq 1$$m,n\geq 1$. Acta Arith. 122 (2006), no. 1, 51–56. Article

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