North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Guidance and Control Panel. Symposium (46th : 1988 : Geilo, Norway)
North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Mechanics Panel. Symposium (1991 : Brussels, Belgium)
North Atlantic Treaty Organization. \b Advisory Group for Aerospace Research and Development. \b Sensor and Propagation Panel. Symposium (1994 : Ottawa, Canada)