1. Department of Information Engineering, University of Florence, 50139 Florence, Italy
2. Department of Education, Literatures, Intercultural Studies, Languages and Psychology, University of Florence, 50135 Florence, Italy
3. Department of Mining Engineering, Istanbul Technical University, Istanbul 34467, Turkey
4. Department of Electrical and Electronics Engineering, Bilgi University, Istanbul 34060, Turkey
5. Department of Computer Science and Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
6. Centre for the Study of Complex Dynamics, University of Florence, 50019 Sesto Fiorentino, Italy