1. University of Malta,Department of Geosciences,Msida,Malta
2. ISPC-CNR,Institute of Science for the Cultural Heritage,Lecce,Italy
3. Diocesis of Lecce,Cultural Heritage Direction,Lecce,Italy
4. University of Calabria,Department of Environmental Engineering DIAM,Calabria,Italy
5. University of Catania,Department of Cultural Heritage,Catania,Italy