M. Böhmer, B. Hecht, J. Schöning, A. Krüger, and G. Bauer. Proceedings of MobileHCI '11: 13th International Conference on Human Computer Interaction with Mobile Devices and Services, Stockholm, Sweden, page 47-56. (2011)
D. Vyas, A. Nijholt, and A. Kröner. Proceedings of MobileHCI '10: 12th International Conference on Human Computer Interaction with Mobile Devices and Services, Lisbon, Portugal, page 415-416. (2010)
D. Sonntag, and M. Möller. Proceedings of IUI '10: 15th International Conference on Intelligent User Interfaces, Hong Kong, China, page 381-384. (2010)
D. Sonntag, and M. Möller. Proceedings of the Sixth International Conference on Intelligent Environments (IE 2010), Kuala Lumpur, Malaysia, page 84--89. Los Alamitos, CA, IEEE Computer Society CPS, (2010)