Scudero S.*1, De Guidi G.1, Caputo R. 2 & Perficaro V.1
1. Department of Biological, Geological and Environmental Sciences, University of Catania, Corso Italia 55, 95129. 2. Department of Physics & Earth Sciences, University of Ferrara, via Saragat 1, 44122 Ferrara, Italy. E-mail: rcaputo@unife.it