Luiz Olavo Bonino da Silva Santos Peter Vink Remco Poortinga van Wijnen A service-oriented middleware for providing context awareness and notification. 6 2007 Middleware (Demos and Posters) http://doi.acm.org/10.1145/1377943.1377950 conf/middleware/2007dp db/conf/middleware/dp2007.html#SantosVW07