The Astronomical Institute of Utrecht, UK
H. G. van Bueren
The Astronomical Institute of Utrecht, UK
G. C. M. Reijnen
Institut für Elektronik der AdW der D.D.R., Neustrelitz, Germany
R. Knuth
Dept. of Astro-Geophysics, University of Colorado, 80309, Boulder, Colo, USA
D. B. Melrose
University of London Observatory, UK
J. E. Guest
Lunar and Planetary Unit, Environmental Science Dept., University of Lancaster, USA
L. Wilson
Institute for Theoretical Physics, University of Utrecht, UK
P. Hut
Kapteyn Sterrenwacht, University of Groningen, UK
C. D. Andriesse
National Physical Laboratory, New Delhi, India
A. P. Mitra
Vening Meinesz Laboratory, for Geophysics and Geochemistry, Utrecht, UK
R. D. Schuiling
Herzberg Institute of Astrophysics NRCC, Ottawa, Canada
Peter M. MIllman