Mikhail Kazakov Habib Abdulrab DL-workbench: a metamodeling approach to ontology manipulation. 2003 conf/eon/2003 EON http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS//Vol-87/EON2003_Kazakov.pdf db/conf/eon/eon2003.html#KazakovA03