1. Forschungszentrum Jülich (IEK-9), D-52425 Jülich, Germany
2. RWTH Aachen University, D-52074 Aachen, Germany
3. LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
4. Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
5. University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia