Ourania Hatzi Georgios Meditskos Dimitris Vrakas Nick Bassiliades Dimosthenis Anagnostopoulos Ioannis P. Vlahavas A Synergy of Planning and Ontology Concept Ranking for Semantic Web Service Composition. 42-51 2008 IBERAMIA http://dx.doi.org/10.1007/978-3-540-88309-8_5 conf/iberamia/2008 db/conf/iberamia/iberamia2008.html#HatziMVBAV08