1. University of Verona, Computer Science Department Strada le Grazie 15 ‐ Ca' Vignal 2 37134 Verona Italy
2. University of CalabriaDepartment of Physics, Via P. Bucci 87036 Arcavacata di Rende CS Italy
3. National Research Council (CNR)Istituto di Chimica Inorganica e delle Superfici (ICIS) Corso Stati Uniti 4 35127 Padua Italy
4. Scientific Methodologies Applied to Cultural Heritage (SMATCH) Largo Ugo Bartolomei 5 00136 Rome Italy