@article{GFA_1992__2_1_58107,
     author = {W.A. Veech},
     title = {The {Billiard} in a {Regular} {Polygon.}},
     journal = {Geometric and functional analysis},
     pages = {341--380},
     year = {1992},
     volume = {2},
     number = {1},
     zbl = {0760.58036},
     url = {http://geodesic.mathdoc.fr/item/GFA_1992__2_1_58107/}
}