1. University of Ljubljana, Faculty of Electrical Engineering, Tržaška cesta 25, SI-1000 Ljubljana, Slovenia
2. SMARTEH Research and Development of Electronic Controlling and Regulating Systems, Poljubinj 114, SI-5220 Tolmin, Slovenia
3. Université de Lorraine, UMR 7565, F-54506 Vandoeuvre-lès-Nancy, France
4. CNRS, UMR 7565, F-54506 Vandoeuvre-lès-Nancy, France