J. Burkhardt, F. Détienne, A. Hébert, L. Perron, S. safin, und P. Leclercq. European Conference on Cognitive Ergonomics: Designing beyond the Product — Understanding Activity and User Experience in Ubiquitous Environments, Seite 30:1–30:9. VTT, Finland, Finland, VTT Technical Research Centre of Finland, (2009)