1. Department of Mechanics, Mathematics & Management, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
2. Arts et Metiers Institute of Technology, 151 Bd de l’Hôpital, 75013 Paris, France
3. Department of Sciences of Agriculture, Food, Natural Resources and Engineering, University of Foggia, Via Napoli 25, 71121 Foggia, Italy
4. National Group of Mathematical Physics (GNFM) of the Italian National Institute of High Mathematics (INDAM), Piazzale Aldo Moro, 5, 00185 Rome, Italy