Jespersen, Sine, Department of Computer Science, Aarhus University Aabogade 34 D, 8200 Aarhus N, Denmark Jonker, Catholijn, Delft University of Technology 2628 CD Delft, Netherlands Joshi, Somya, Stockholm University Borgarfjordsgatan 12 Jurmu, Marko, University of Oulu, Finland
