1. Institute of Mechanics Materials, via al Monlino 6 6916 Lugano-Grancia, Switzerland
2. Joint Research Centre, via Fermi 21020 Ispra, Italy
3. ENEL, Polo Idraulico Struthurale, via Pozzobonelli 6 20162 Milan, Italy
4. ANPA, via V. Brancati 00100 Rome, Italy