Laboratory of Space Research, Utrecht
K. A. van der Hucht, H. F. van Beek, R. Mewe, C de Jager, C. de Jager, R. Waters & J. Schrijver
Estec Noordwijk
A. Pedersen
Astronomical Institute, Bratislava
Ľ. Kesák
Observatory Sonnenborgh, University of Utrecht, Utrecht
C. Zwaan
Astronomical Institute at Ondŕejov, Ondŕejov
F. Fárník
Research Center for Geodynamics and Astronomy (CERGA), Grasse, France
J. Kovalevsky
European Space Research and Technology Center (ESTEC) at Noordwijk, Noordwijk
D. E. Page
Leiden Observatory, Leiden
A. M. van Genderen
Service of Astrophysique, Institut de Recherche Fondamentale, Saclay
L. Koch-Miramond & Arne Pedersen
Laboratory for Aero-and Hydrodynamics, Technical University at Delft, Delft
G. Ooms
Kiruna Geophysical Institute at Kiruna, Kiruna
Bengt Hultqvist