M. Barz, M. Moniri, M. Weber, and D. Sonntag. Adjunct Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp '16), Heidelberg, Germany, page 17--20. New York, ACM, (2016)
H. van Heerde. Centre for Telematics and Information Technology, University of Twente, Enschede, The Netherlands, (June 2010)CTIT Ph.D. thesis series no. 10-166.