Netherlands Agency for Aerospace Programs, NIVR at Delft, Netherlands
P.F.J. Linssen
Astronomical Institute at On\'drejov, On\'drejov, Netherlands
B. Valníček
Collège de France Paris, Paris, France
Jean-Claude Pecker
M. V. Keldysh Institute of Applied Mathematics at Moscow, Moscow, Russian
M. Ya Marov
Astronomical Observatory Pulkovo at Leningrad, Leningrad, Russian
V.K. Abalakin
Astronomical Institute at Utrecht, Utrecht, UK
A. Achterberg
Astronomical Institute at Utrecht, Utrecht, UK
M. Kuperus
Max-Planck-Institut für extraterrestrische Physik Garching, Garching, Germany
M. Sterzik