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WikiPedia: Venera-D http://www.russianspaceweb.com/venera_d.html http://venera-d.cosmos.ru/index.php?id=658&L=2 http://www.gazeta.ru/science/news/2012/04/09/n_228... https://www.space.com/35333-russia-nasa-venus-miss... https://solarsystem.nasa.gov/docs/Venera-D_Final_R... https://web.archive.org/web/20170427190638/https:/...