Free University, Amsterdam, The Netherlands
J. W. Hovenier
Tel Aviv University, Tel Aviv
Yuval Ne'eman
Ondřejov Observatory, Ondřejov
J. Kleczek
Space Research Organization Netherlands, Utrecht
P. vn Nes
Central Research Institute for Physics, Budapest
A. J. Somogyi
SRON Laboratory for Space Research, Utrecth
R. Mewe
Polish Academy of Sciences, Space Research Centre, the Netherlands
Klos Z.
National Center of Scientific Research, Aeronomy Service, Verrières-Le-Buisson
J. L. Bertaux
Delft University of Technology, the Netherlands
H. F. van Beek
Institute for Theoretical Physicsstitute for Theoretical Physicsstitute for Theoretical Physics, Utrecht
G. 'T Hooft