North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Guidance and Control Panel. Symposium (51st : 1990 : Instituto Nacional de Industria, Madrid)
North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Guidance and Control Panel. Symposium (38th : 1984 : Naval Post Graduate School)
North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Guidance and Control Panel. Symposium (44th : 1987 : Athens, Greece)