Inanç Seylan Enrico Franconi Jos de Bruijn Effective Query Rewriting with Ontologies over DBoxes. 923-925 2009 IJCAI http://ijcai.org/papers09/Papers/IJCAI09-157.pdf conf/ijcai/2009 db/conf/ijcai/ijcai2009.html#SeylanFB09