Netherlands Agency for Aerospace Programs (NIVR), The Netherlands
D. de Hoop
Laboratory for Space Research, Utrecht
N. R. Trams & HoyngHoyngHoyng P.
Astronomical Institute, University of Amsterdam, The Netherlands
E. P. J. van den Heuvel
Sonnenborgh Observatory, Utrecht
J. R. W. Heintze
Astronomical Institute of the University, Bonn
K. S. de Boer
Huygens Laboratory, University of Leiden, The Netherlands
Greenberg J. Mayo
Servide d'Astrophysique Département de Physique Générale, CEN-Saclay, Germany
L. Koch-Miramond
Space Research Laboratory, Utrecht
Rens Waters
Institute of Astrophysics, Paris
F. van 't Veer
University of Observatory at Jena, Paris
Th. Henning
Kapteyn Astronomical Institute, Groningen
P. C. van der Kruit
Observatory of the University at Leiden, The Netherlands
V. Icke
Institute of Physics, Vilnius, Lithuania, USSR
V. Straižzys