Bernardo Gonçalves José Gonçalves Pereira Filho Giancarlo Guizzardi A service architecture for sensor data provisioning for context-aware mobile applications. 1946-1952 2008 SAC http://doi.acm.org/10.1145/1363686.1364155 conf/sac/2008 db/conf/sac/sac2008.html#GoncalvesFG08