@article{ACIRM_2009__1_1_61_0,
     author = {Thomas A. Schmidt},
     title = {Rosen fractions and {Veech} groups, an overly brief introduction},
     journal = {Actes des rencontres du CIRM},
     pages = {61--67},
     publisher = {CIRM},
     volume = {1},
     number = {1},
     year = {2009},
     doi = {10.5802/acirm.11},
     zbl = {06938559},
     language = {en},
     url = {https://acirm.centre-mersenne.org/articles/10.5802/acirm.11/}
}