J. Feng, M. Johnston, und S. Bangalore. Proceedings of the 20th international conference companion on World wide web, Seite 293--294. New York, NY, USA, ACM, (2011)
P. Ehlen, und M. Johnston. Proceedings of the 16th international conference on Intelligent user interfaces, Seite 435--436. New York, NY, USA, ACM, (2011)
K. Church, und N. Oliver. Proceedings of the 13th International Conference on Human Computer Interaction with Mobile Devices and Services, Seite 67--76. New York, NY, USA, ACM, (2011)