1. Institute of Mechanics and Shell Structures and Dresden Center for Computational Materials Science; Technical University Dresden; Dresden 01062 Germany
2. Modeling and Scientific Computing; MATHICSE - EPFL; Avenue Piccard, Station 8 Lausanne 1015 Switzerland
3. Institute of Mechanics, Department of Engineering; University of Duisburg-Essen; Universitätsstraße 15 Essen 45141 Germany
4. Mathematisches Institut; Universität zu Köln; Weyertal 86-90 Köln 50931 Germany
5. MOX, Politecnico di Milano; via Bonardi 9 Milan 20133 Italy
6. Institute of Numerical Mathematics and Optimization; Technische Universität Bergakademie Freiberg; Akademiestraße 6 Freiberg 09599 Germany