Michele Tomaiuolo Paola Turci Federico Bergenti Agostino Poggi A Two-Level Approach for Ontology Management in Multi-Agent Systems. 21-26 2005 conf/wetice/2005 WETICE http://doi.ieeecomputersociety.org/10.1109/WETICE.2005.13 db/conf/wetice/wetice2005.html#TomaiuoloTBP05