1. Faculty of Physics
2. Adam Mickiewicz University
3. Poznan 62-614
4. Poland
5. Department of Chemistry and Chemical Technologies
6. University of Calabria
7. 87036 Rende
8. Italy
9. Dip. STEBICEF
10. University of Palermo
11. Viale delle Scienze
12. I-90128 Palermo
13. CNR-ISMN
14. National Council of Research
15. Institute for the Study of Nanostructured Materials
16. RM