Ioanna Roussaki Maria Strimpakou Nikos Kalatzis Miltiades E. Anagnostou Carsten Pils Hybrid context modeling: A location-based scheme using ontologies. 2-7 2006 conf/percom/2006w PerCom Workshops http://doi.ieeecomputersociety.org/10.1109/PERCOMW.2006.65 db/conf/percom/percomw2006.html#RoussakiSKAP06