1. Space Research Institute Austrian Academy of Sciences Graz Austria
2. Now at Ericsson EAS Rosenheim Germany
3. Now at Thomas Oswald Aerospace Software Weinitzen Austria
4. Chair in RF and Photonics Technische Universität Dresden Dresden Germany
5. Now at Commission for Astronomy Austrian Academy of Sciences Graz Austria
6. Department of Physics and Astronomy University of Iowa Iowa City IA USA