%0 Journal Article
%A Vladimir A. Koibaev
%T On a question about generalized congruence subgroups
%J Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika
%D 2018
%P 66-69
%V 11
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JSFU_2018_11_1_a9/
%G en
%F JSFU_2018_11_1_a9