OPPORTUNITY: Towards opportunistic activity and context recognition systems
Roggen, Daniel and Forster, K and Calatroni, Alberto and Holleczek, Thomas and Fang, Yu and Troster, G and Lukowicz, Paul and Pirkl, Gerald and Bannach, David and Kunze, Kai and others. World of Wireless, Mobile and Multimedia Networks \& Workshops, 2009. WoWMoM 2009. IEEE International Symposium on a. 2009.