1. Institute of Electronic and Information Systems, Novgorod State University, 173003 Veliky Novgorod, Russian Federation
2. Ulyanovsk State University, 432017 Ulyanovsk, Russian Federation
3. Donetsk Physical and Technical Institute of the National Academy of Sciences of Ukraine, 83114 Donetsk, Ukraine
4. Lab-STICC (UMR 6285), CNRS, UBL, École Nationale d'Ingénieurs de Brest, 29238 Brest Cedex 3, France