1. School of Innovation, Design, and Engineering, Mälardalen University, Eskilstuna, Sweden
2. Computer Science Department, University of Malaga, Malaga, Spain
3. DHLab, University of Roma Tre, Rome, Italy
4. Department of Mathematics and Physics, University of Campania “Luigi Vanvitelli”, Caserta, Italy
5. Department of Mathematics and Informatics, University of Florence, Florence, Italy