%0 Journal Article %A Yuk-Kam Lau %A Kai-Man Tsang %T A mean square formula for central values of twisted automorphic $L$-functions %J Acta Arithmetica %D 2005 %P 231-262 %V 118 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa118-3-2/ %R 10.4064/aa118-3-2 %G en %F 10_4064_aa118_3_2