Agent-Based Technologies and Applications for Enterprise Interoperability : International Workshops, ATOP 2005, Utrecht, The Netherlands, July 25-26, 2005, and ATOP 2008, Estoril, Portugal, May 12-13, 2008, Revised Selected Papers - Klaus Fischer, Jörg P. Müller, James Odell, Arne Jørgen Berre ((Lecture Notes in Business Information Processing))