TY  - JOUR
AU  - A. N. Andrianov
AU  - O. M. Fomenko
TI  - Distribution of the norms of the hyperbolic elements of the modular group and the class number of indefinite binary quadratic forms
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 743
EP  - 745
VL  - 196
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_196_4_a0/
LA  - ru
ID  - DAN_1971_196_4_a0
ER  -