@article{10_4064_aa122_1_5,
     author = {Huaning Liu and Wenpeng Zhang},
     title = {On the mean value of $L(m,\chi )L(n,\overline {\chi })$ at 
 positive integers $m,n\geq 1$},
     journal = {Acta Arithmetica},
     pages = {51--56},
     publisher = {mathdoc},
     volume = {122},
     number = {1},
     year = {2006},
     doi = {10.4064/aa122-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa122-1-5/}
}