%0 Journal Article %A Huaning Liu %A Wenpeng Zhang %T On the mean value of $L(m,\chi )L(n,\overline {\chi })$ at positive integers $m,n\geq 1$ %J Acta Arithmetica %D 2006 %P 51-56 %V 122 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa122-1-5/ %R 10.4064/aa122-1-5 %G en %F 10_4064_aa122_1_5