1. Faculty of Physics and Engineering Moldova State University; Alexei Mateevici, 60 MD-2009 Chisinau Republic of Moldova
2. Ghitu Institute of Electronic Engineering and Nanotechnologies Academy of Sciences of Moldova; Academiei, 3/3 MD-2028 Chisinau Republic of Moldova
3. Engineering Department “Vasile Alecsandri” University of Bacau; Calea Marasesti, 157 RO-600115 Bacau Romania
4. Department of Materials Science Tallinn University of Technology; Ehitajate tee, 5 EE-19086 Tallinn Estonia