1. Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
2. Max-Planck Institut für Radio Astronomie (Germany)
3. NOVA ASTRON (Netherlands)
4. Euopean Southern Observatory (Germany)
5. European Southern Observatory (Germany)
6. Max-Planck Institut für Astronomie (Germany)
7. Huygens Lab. (Netherlands)