%0 Journal Article
%A A. N. Andrianov
%A O. M. Fomenko
%T Distribution of the norms of the hyperbolic elements of the modular group and the class number of indefinite binary quadratic forms
%J Doklady Akademii Nauk
%D 1971
%P 743-745
%V 196
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_196_4_a0/
%G ru
%F DAN_1971_196_4_a0