Observatoire de Paris - Meudon, France
J. Lequeux
Institute of Law Science at Utrecht, Utrecht, Germany
G. C. M. Reijnen
Astronomical Institute, Ondrejov, Czechoslovakia
Josip Kleczek
University of Western Ontario, Ontario, Canada
D. F. Gray
Observatoire Royal de Belgique, Belgium
J. Dommanget
The Astronomical Institute at Utrecht, Utrecht, Germany
O. Namba, Verbunt Frank, Cornelis De Jager, H. G. van Bueren, A. D. Fokker & Roel Hoekstra
Institute of Astronomy, Cambridge, USA
Gertian Savonije
Vrije Universiteit, Amsterdam, UK
J. W. Hovenier
Kiruna Geophysical Institute, Germany
Bengt Hultqvist
Astronomical Institute, Slovak Academy of Sciences, Bratislava, Czechoslovakia
L. Kresák