1. Faculty of Mathematics and Informatics, Babeş-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania.
2. Technische Universitaet Darmstadt, Intelligent Autonomous Systems Group, Hochschulstr. 10, 64289 Darmstadt, Germany.
3. Max Planck Institute for Intelligent Systems, Spemannstr. 38, 7206 Tuebingen, Germany.