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Antonio Maturo
Department of Humanities, Arts and Social Science, University G. D'Annunzio of Chieti-Pescara, Via dei Vestini, 31, 66100 Chieti, Italy.
Fabrizio Maturo
Department of Quantitative-Economic and Philosophical-Educational Science, University G. D'Annunzio of Chieti-Pescara, Viale Pindaro, 42, 65100 Pescara, Italy.