1. Department of Mechanics, Faculty of Civil Engineering; Czech Technical University in Prague; Thákurova 7, 166 29 Prague 6 Czech Republic
2. Materials Innovation Institute (M2i); PO Box 5008 Delft 2600 GA The Netherlands
3. Department of Mechanical Engineering; Eindhoven University of Technology; PO Box 513 Eindhoven 5600 MB The Netherlands
4. Institute of Scientific Computing; Technische Universitãt Braunschweig; Braunschweig D-38092 Germany