Elias Zavitsanos Sergios Petridis Georgios Paliouras George A. Vouros Learning Ontologies of Appropriate Size. 327-338 2008 SETN http://dx.doi.org/10.1007/978-3-540-87881-0_29 conf/setn/2008 db/conf/setn/setn2008.html#ZavitsanosPPV08