@article{AFM_1999_24_1_a14, author = {Shuechin Huang}, title = {Generalized {Hecke} groups and {Hecke} polygons}, journal = {Annales Fennici Mathematici}, pages = {187--214}, publisher = {mathdoc}, volume = {24}, number = {1}, year = {1999}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AFM_1999_24_1_a14/} }