Valentina Cordì Paolo Lombardi Maurizio Martelli Viviana Mascardi An Ontology-Based Similarity between Sets of Concepts. 16-21 2005 conf/woa/2005 WOA http://lia.deis.unibo.it/books/woa2005/papers/3.pdf db/conf/woa/woa2005.html#CordiLMM05