Source and copyright
Source: European Space Agency Science Programme Committee. Report on International Cooperation with USA, Russia, China, Japan, IACG for 1993, ESA/SPC(93)50. Paris: 23.01.1974, Historical Archives of the European Union 2013, Villa Salviati – via Bolognese 156, I-50139 Firenze – Italy, ESTEC MASTER FILE.
Copyright: (c) European Space Agency. All rights reserved.