K. Church, A. Cousin, и N. Oliver. Proceedings of the 14th international conference on Human-computer interaction with mobile devices and services, стр. 393--402. New York, NY, USA, ACM, (2012)
A. Amin, S. Townsend, J. Ossenbruggen, и L. Hardman. Proceedings of the 12th IFIP TC 13 International Conference on Human-Computer Interaction: Part I, стр. 736--749. Berlin, Heidelberg, Springer-Verlag, (2009)