Ourania Hatzi Georgios Meditskos Dimitris Vrakas Nick Bassiliades Dimosthenis Anagnostopoulos Ioannis P. Vlahavas Semantic Web Service Composition Using Planning and Ontology Concept Relevance. 418-421 2009 Web Intelligence http://dx.doi.org/10.1109/WI-IAT.2009.71 conf/webi/2009 db/conf/webi/webi2009.html#HatziMVBAV09