%0 Journal Article
%A D. A. Kazhdan
%T On A characteristic of congruence subgroups of the group $G=SL(2,\mathbb{Z})$
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 1970
%P 89-90
%V 4
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_1970_4_2_a14/
%G ru
%F FAA_1970_4_2_a14