@article{AMBP_2021__28_2_199_0,
     author = {Flavien Mabilat},
     title = {Combinatoire des sous-groupes de congruence du groupe modulaire {II}},
     journal = {Annales math\'ematiques Blaise Pascal},
     pages = {199--229},
     publisher = {Universit\'e Clermont Auvergne, Laboratoire de math\'ematiques Blaise Pascal},
     volume = {28},
     number = {2},
     year = {2021},
     doi = {10.5802/ambp.404},
     language = {fr},
     url = {https://ambp.centre-mersenne.org/articles/10.5802/ambp.404/}
}