1. Université Libre de Bruxelles
2. 1050 Brussels
3. Belgium
4. Faculty of Mathematics and Informatics
5. Sofia University St. Kliment Ohridski
6. Sofia
7. Bulgaria
8. Department of Physical Electronics at the Faculty of Science
9. Masaryk University
10. 61137 Brno
11. Czech Republic
12. Central European Institute of Technology – CEITEC