TY  - JOUR
AU  - Juliet Britto
TI  - On the construction of non-congruence subgroups
JO  - Acta Arithmetica
PY  - 1977
SP  - 261
EP  - 267
VL  - 33
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/aa-33-3-261-267/
DO  - 10.4064/aa-33-3-261-267
LA  - en
ID  - 10_4064_aa_33_3_261_267
ER  -