1. Lappeenranta University of Technology; PO Box 20 Lappeenranta Finland
2. South-West State University; 50 let Oktjabrja Str. 305040 Kursk Russia
3. Institute of Applied Physics; Academy of Sciences of Moldova; Academiei Str. 5 2028 Kishinev Moldova
4. RRC “Kurchatov Institute”; Kurchatov sq. 1 123182 Moscow Russia
5. A. F. Ioffe Physico-Technical Institute; 194021 St. Petersburg Russia