Fausto Giunchiglia Uladzimir Kharkevich Ilya Zaihrayeu Concept Search: Semantics Enabled Syntactic Search. 109-123 2008 SemSearch http://ceur-ws.org/Vol-334/paper-10.pdf conf/esws/2008semsearch db/conf/esws/semsearch2008.html#GiunchigliaKZ08