J. Mackinlay, R. Rao, und S. Card. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, Seite 67--73. New York, NY, USA, ACM Press/Addison-Wesley Publishing Co., (1995)
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)
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)