P. Quinn, and A. Cockburn. Proceedings of the 21st Annual Conference of the Australian Computer-Human Interaction Special Interest Group: Design: Open 24/7, page 185--192. New York, NY, USA, ACM, (2009)
M. Dörk, S. Carpendale, and C. Williamson. Proceedings of the International Working Conference on Advanced Visual Interfaces, page 233--240. New York, NY, USA, ACM, (2012)