Bibliography
- Kul91
-
Ravi S. Kulkarni.
An arithmetic-geometric method in the study of the subgroups of the modular group.
Amer. J. Math., 113(6):1053--1133, 1991.
- Ver00
-
H. A. Verrill.
Fundamental domain drawing program.
http://hverrill.net/fundomain/, 2000.
V2.28, 13 July 2023