Gesture and Sign Language in Human-Computer Interaction and Embodied Communication 9th International Gesture Workshop, GW 2011, Athens, Greece, May 25-27, 2011, Revised Selected Papers - Efthimiou, Eleni; Kouroupetroglou, Georgios; Fotinea, Stavroula-Evita (Springer Berlin Heidelberg : Imprint: Springer, 2012)