%0 Journal Article %A K. Soundararajan %T Nonvanishing of quadratic Dirichlet $L$-functions at $s=\frac{1}{2}$ %J Annals of mathematics %D 2000 %V 152 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM_2000_152_2_a2/ %F AM_2000_152_2_a2