N. Kern, B. Shiele, J. Holger, P. Lukowicz, and G. Troster, Wearable sensing to annotate meeting recordings Euro-Par, LNCS, vol.7, issue.5, pp.263-274, 2003.
DOI : 10.1007/s00779-003-0242-y

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.13.1331

M. Wiklund, Usability in practice: how companies develop user-friendly products, 1994.