1. Universite Blaise Pascal, Avenue des Landais 24, 63177 Clermont-Ferrand, France
2. A.Ya. Usikov Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12 Ak. Proskury Street, Kharkov 61085, Ukraine
3. L.N. Gumilyov Eurasian National University, 2 Mirzoyana Street, Astana 010000, Kazakhstan