Outer Space Division of the United Nations at New York, New York, USA
Hans Joachim Haubold
Astronomiches Institut Tübingen, Tübingen, Germany
M. A. J. Snijders
Astrophysical Institute of the Free University, Brussels, Belgium
W. van Rensbergen
Laboratory for Space Research, Utrecht, The Netherlands
Cornelis de Jager
Sterrewacht Leiden, Leiden
R. van de Weygaert
Astronomical Institute, Utrecht, The Netherlands
A. Achterberg
Netherlands Agency for Aerospace Programs (NIVR), Delf, The Netherlands
P. F. J. Linssen
Laboratory for Space Research at Utrecht, Utrecht, The Netherlands
P. Hoyng
Astronomical Institute, Ondrejov, Czechoslovakia
J. Kleczek
Space Research Institute of the Austrian Academy of Sciences, Graz, Austria
Siegfried J. Bauer
Nagoya University, Nagoya
S. Hayakawa