Affiliation: | 1.Institute of Mathematics, NASU, 3 Tereshchenkivska St., Kyiv, Ukraine ;2.Kyiv School of Economics, 92-94 Dmytrivska St., Kyiv, Ukraine ;3.Department of Law, University of Naples ‘Federico II’, Via Mezzocannone 16, 80134, Naples, Italy ;4.Vienna University of Economics and Business Administration, Welthandelsplatz 1 Building D4, 1020, Vienna, Austria ; |