1. University of Macerata, Macerata, Italy, V.N. Karazin Kharkiv National University,Department of Political Sciences, Communication and International Relations,Kharkiv,Ukraine
2. V. N. Karazin Kharkiv National University,Department of Applied Mathematics,Kharkiv,Ukraine
3. Marche Polytechnic University,Department of Information Engineering,Ancona,Italy
4. University of Macerata,Department Economics and Law,Macerata,Italy