TY  - JOUR
AU  - Akbas, M.
AU  - Singerman, D.
TI  - The normalizer of Γ0(N) in PSL(2, R)
JO  - Glasgow mathematical journal
PY  - 1990
SP  - 317
EP  - 327
VL  - 32
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S001708950000940X/
DO  - 10.1017/S001708950000940X
ID  - 10_1017_S001708950000940X
ER  -