1. Rheinkalk GmbH, Wülfrath, Germany
2. Fraunhofer Institute for Electronic Nano Systems, Chemnitz, Germany
3. Department of Microsystems and Precision Engineering, Chemnitz University of Technology, Chemnitz, Germany
4. Research & Development, Polytec GmbH, Waldbronn, Germany
5. Department of Automatic Control, University of Wuppertal, Wuppertal, Germany