TY  - JOUR
AU  - L. Parson
TI  - On the invariants of the Hecke groups
JO  - Acta Arithmetica
PY  - 1981
SP  - 217
EP  - 227
VL  - 40
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/aa-40-2-217-227/
DO  - 10.4064/aa-40-2-217-227
LA  - en
ID  - 10_4064_aa_40_2_217_227
ER  -