1. CISUC - DEI, University of Coimbra, Coimbra, Portugal & Polytechnic Institute of Viseu, Viseu, Portugal
2. Centre de Recherche Public Henri Tudor, Luxembourg & Computer Science and Communications Research Unit (CSC), University of Luxembourg, Luxembourg
3. Computer Science and Communications Research Unit (CSC), University of Luxembourg, Luxembourg
4. CISUC - DEI, University of Coimbra, Coimbra, Portugal
5. Centre de Recherche Public Henri Tudor, Luxembourg