1. Dipartimento di Scienze Aziendali-Management and Innovation Systems (DISA-MIS), University of Salerno, Fisciano, Italy
2. Dipartimento di Scienze Umane, Filosofiche e della Formazione, University of Salerno, Fisciano, Italy
3. Department of Applied Mathematics and Informatics, Belarusian State University, Minsk, Belarus
4. Department of Information Engineering, Electrical Engineering and Applied Mathematics, University of Salerno, Fisciano, Italy