@article{CMH_1981__56_139864,
     author = {D.R. Heath-Brown},
     title = {An asymptotic series for the mean value of {Dirichlet} {L-functions.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {148--162},
     publisher = {mathdoc},
     volume = {56},
     year = {1981},
     zbl = {0457.10020},
     url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139864/}
}