Geodesic
Macbeath's curve and the modular group
Glasgow mathematical journal, Tome 26 (1985), pp. 239-247

Voir la notice de l'article provenant de la source Cambridge University Press

The theory of algebraic curves associated with subgroups of finite index in the modular group Γ is highly developed for such subgroups of Γ as may be defined by means of congruences in the ring Z of rational integers. The situation in he case of non-congruence subgroups of Γ, on the other hand, is drastically different. It reduces to a few isolated examples, two of which may be found in [12]. Related research by A. O. L. Atkin and H. P. F. Swinnerton-Dyer began in [1]. 
Wohlfahrt, K. Macbeath's curve and the modular group. Glasgow mathematical journal, Tome 26 (1985), pp. 239-247. doi: 10.1017/S0017089500006212
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