F. Lonczewski. Proceedings of the 2nd international conference on Intelligent user interfaces, Seite 253--256. Orlando, Florida, United States, ACM Press, (1997)
A. Garc\'ıa Frey. Proceedings of the 2Nd ACM SIGCHI Symposium on Engineering Interactive Computing Systems, Seite 341--344. New York, NY, USA, ACM, (2010)
A. Garc\'ıa Frey, G. Calvary, und S. Dupuy-Chessa. Proceedings of the 2Nd ACM SIGCHI Symposium on Engineering Interactive Computing Systems, Seite 41--46. New York, NY, USA, ACM, (2010)