1. Dept. of Informatics-Systems, Universität Klagenfurt, Klagenfurt, Austria
2. Dept. of Computer Science, University of British Columbia -Okanagan, Kelowna, Canada
3. Cheriton School of Computer Science, University of Waterloo, Waterloo, Canada
4. Dept. of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Canada