1. University of Bonn & Fraunhofer IAIS & ITMO University, Bonn, Germany
2. University of Bonn, Bonn, Germany
3. Karlsruhe Institute of Technology, Karlsruhe, Germany
4. University of Bonn & Fraunhofer IAIS, Sankt Augustin, Germany
5. Fraunhofer IAIS, Bonn, Germany
6. Leibniz Universität Hannover / TIB Information Center, Germany