Diego Calvanese Giuseppe De Giacomo Domenico Lembo Maurizio Lenzerini Antonella Poggi Mariano Rodriguez-Muro Riccardo Rosati Ontologies and Databases: The DL-Lite Approach. 255-356 2009 Reasoning Web http://dx.doi.org/10.1007/978-3-642-03754-2_7 conf/rweb/2009 db/conf/rweb/rweb2009.html#CalvaneseGLLPRR09