1. Newman W, Lamming M (1995) Interactive system design. Addison Wesley, Reading
2. Nielsen J (1993) Usability engineering. Morgan Kaufmann, San Francisco
3. Rotuaari research project (2006) http://www.rotuaari.net , accessed June 4
4. Välkkynen P, Korhonen I, Plomp J, Tuomisto T, Cluitmans L, Ailisto H, Seppä S (2003) A user interaction paradigm for physical browsing and near-object control based on tag. In: Proceedings of the workshop on real world user interfaces, Udine, Italy, pp 31–34
5. Ailisto H, Korhonen I, Plomp J, Pohjanheimo L, Strömmer E (2003) Realising Physical selection for mobile devices. In: Proceedings of the workshop on real world user interfaces, Udine, Italy, pp 38–41