%0 Journal Article %A Shuechin Huang %T Generalized Hecke groups and Hecke polygons %J Annales Fennici Mathematici %D 1999 %P 187-214 %V 24 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AFM_1999_24_1_a14/ %G en %F AFM_1999_24_1_a14