%0 Journal Article %A Mauro Artigiani %A Luca Marchese %A Corinna Ulcigrai %T The Lagrange spectrum of a Veech surface has a Hall ray %J Groups, geometry, and dynamics %D 2016 %P 1287-1337 %V 10 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4171/ggd/384/ %R 10.4171/ggd/384 %F 10_4171_ggd_384