1. Institute of Mechanics Technische Universität Berlin Einsteinufer 5 Berlin 10967 Germany
2. Division of Applied Mechanics Uppsala University Department of Materials Science and Engineering Box 534 Uppsala 751 21 Sweden
3. International Research Center on Mathematics and Mechanics of Complex Systems Università degli Studi dell'Aquila Via Giovanni Gronchi 18 ‐ Zona industriale di Pile L'Aquila 67100 Italy
4. Engineering Faculty International Telematic University Uninettuno Corso Vittorio Emanuele II Rome 39 00186 Italy