TY  - JOUR
AU  - Elkies, Noam D.
TI  - The automorphism group of the modular curve $X_0(63)$
JO  - Compositio Mathematica
PY  - 1990
SP  - 203
EP  - 208
VL  - 74
IS  - 2
PB  - Kluwer Academic Publishers
UR  - http://archive.numdam.org/item/CM_1990__74_2_203_0/
LA  - en
ID  - CM_1990__74_2_203_0
ER  -