%0 Journal Article
%A Huaning Liu
%A Wenguang Zhai
%T The equation $n_1n_2=n_3n_4$, the gcd-sum function and the mean values of certain character sums
%J Acta Arithmetica
%D 2012
%P 137-157
%V 152
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/aa152-2-2/
%R 10.4064/aa152-2-2
%G en
%F 10_4064_aa152_2_2