TY  - JOUR
AU  - M.-L. Lang
AU  - C.-H. Lim
AU  - S.-P. Tan
TI  - Independent generators for congruence subgroups of Hecke groups.
JO  - Mathematische Zeitschrift
PY  - 1995
SP  - 569
EP  - 594
VL  - 220
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1995__220_1_174827/
ID  - MZ_1995__220_1_174827
ER  -