1. DiSFiPEQ, University of Chieti-Pescara, Viale Pindaro 42, Pescara 65127, Italy
2. MetaLAB (at) Harvard, 42 Kirkland St, Cambridge 20138, MA, USA
3. School of Computer Science and Mathematics, Universitat Rovira I Virgili, Av.da Paisos Catalans 26, Tarragona 43004, Spain
4. Department of Physics and Astronomy “Galileo Galilei”, University of Padova, Italy Via Francesco Marzolo 8, Padova 35121, Italy