Institution: | 1. Department of Information Engineering, Computer Science and Mathematics, University of L’Aquila, Via Vetoio, Loc. Coppito, L’Aquila, 67100, Italy 2. Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, Provinciale Lecce-Arnesano, P.O. Box 193, Lecce, 73100, Italy 3. Gran Sasso Science Institute, L’Aquila, Italy 4. Department of Economic Studies, University of Chieti-Pescara, Viale Pindaro 42, 65127?, Pescara, Italy
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