Mathematical Institute of the University at Groningen, Groningen, The Netherlands
A. I. van de Vooren
Astronomical Institute at Utrecht, Utrecht, The Netherlands
H. Nieuwenhuyzen
Huygens Laboratory, Leiden
B. N. Swanenburg
Astronomical Institute Ondrějov, Czechoslovakia
Josip Kleczek
Institute of Theoretical Physics, Utrecht
B. R. A. Nyboer
University of Oxford, UK
D. W. Sciama
Kanazawa Institute of Technology, Ishikawa
S. Mukai
Technisch Physische Dienst, Institute of Applied Physics, Delft
H. Bokhove
Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, Germany
W. I. Axford
Lab. for Aero- and Hydrodynamics, Delft
G. Ooms
University College, London
J. E. Guest
Technological University, Delft, The Netherlands
H. Wittenberg
Laboratory Astrophysics Group, Leiden
A. G. G. M. Tielens