Tomas Vitvar Adrian Mocan Maciej Zaremba Formal Model for Semantic-Driven Service Execution. 567-582 2008 International Semantic Web Conference http://dx.doi.org/10.1007/978-3-540-88564-1_36 conf/semweb/2008 db/conf/semweb/iswc2008.html#VitvarMZ08