In: Julie A. Jacko (Hrsg.). Human-Computer Interaction. Interaction Techniques and Environments - 14th International Conference, HCI International 2011. Human Computer Interaction International Conferences (HCII-2011), July 9-14, Orlando, FL, USA, Pages 358-367, Lecture Notes in Computer Science (LNCS), Vol. 6762, ISBN 978-3-642-21604-6, Springer, 2011.