| Affiliation: | (1) Outer Space Division of the United Nations at New York, New York, USA;(2) Astronomiches Institut Tübingen, Tübingen, Germany;(3) Astrophysical Institute of the Free University, Brussels, Belgium;(4) Laboratory for Space Research, Utrecht, The Netherlands;(5) Sterrewacht Leiden, Leiden;(6) Astronomical Institute, Utrecht, The Netherlands;(7) Netherlands Agency for Aerospace Programs (NIVR), Delf, The Netherlands;(8) Laboratory for Space Research at Utrecht, Utrecht, The Netherlands;(9) Astronomical Institute, Ondrejov, Czechoslovakia;(10) Space Research Institute of the Austrian Academy of Sciences, Graz, Austria;(11) Nagoya University, Nagoya |
