Diego Calvanese Giuseppe De Giacomo Domenico Lembo Maurizio Lenzerini Riccardo Rosati Epistemic First-order Queries over Description Logic Knowledge Bases. 2006 conf/dlog/2006 Description Logics http://www.ceur-ws.org/Vol-189/submission_17.pdf db/conf/dlog/dlog2006.html#CalvaneseGLLR06