TY - JOUR AU - Mauro Artigiani AU - Luca Marchese AU - Corinna Ulcigrai TI - The Lagrange spectrum of a Veech surface has a Hall ray JO - Groups, geometry, and dynamics PY - 2016 SP - 1287 EP - 1337 VL - 10 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.4171/ggd/384/ DO - 10.4171/ggd/384 ID - 10_4171_ggd_384 ER -