1. L-NESS and Department of Materials Science
2. University of Milano-Bicocca
3. 20125 Milan
4. Italy
5. V. Lashkarev Institute of Semiconductor Physics NAS Ukraine
6. L-NESS and Department of Physics
7. Politecnico di Milano
8. 22100 Como
9. IMM-CNR
10. 95128 Catania
11. 95121 Catania
12. LPE
13. LPE S.p.A
14. 20021 Baranzate