1. FZI Research Center for Information Technology, Germany
2. University of Bayreuth, Germany and IT University Copenhagen, Denmark
3. Otto-von-Guericke University, Germany and Ruhr-University Bochum, Germany
4. Technische Universitaet Braunschweig, Germany
5. ABB Corporate Research Germany, Germany
6. Humboldt-Universitaet zu Berlin, Germany and University of Bern, Switzerland
7. Karlsruhe Institute of Technology, Germany
8. IT University Copenhagen, Denmark