Thomas Eiter Giovambattista Ianni Thomas Krennwallner Axel Polleres Rules and Ontologies for the Semantic Web. 1-53 2008 Reasoning Web http://dx.doi.org/10.1007/978-3-540-85658-0_1 conf/rweb/2008 db/conf/rweb/rweb2008.html#EiterIKP08