N. Weibel, L. Cowan, L. Pina, W. Griswold, und J. Hollan. Adjunct Proceedings of the 23Nd Annual ACM Symposium on User Interface Software and Technology, Seite 405--406. New York, NY, USA, ACM, (2010)Poster.
R. Martin, und S. Weiss. Proceedings of the 8th conference on Human-computer interaction with mobile devices and services, Seite 195--198. Helsinki, Finland, ACM, (2006)