Hans Akkermans Ziv Baida Jaap Gordijn Nieves Peña Ander Altuna Iñaki Laresgoiti Value Webs: Using Ontologies to Bundle Real-World Services. 57-66 2004 19 IEEE Intelligent Systems 4 http://doi.ieeecomputersociety.org/10.1109/MIS.2004.35 db/journals/expert/expert19.html#AkkermansBGPAL04