Paolo Atzeni Stefano Paolozzi Pierluigi Del Nostro Ontologies And Databases: Going Back And Forth. 9-16 2008 ODBIS http://www.vldb.org/conf/2008/workshops/WProc_ODBIS/paper_12.pdf conf/odbis/2008 db/conf/odbis/odbis2008.html#AtzeniPN08