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Wade, Mark. "DS-P1". Encyclopedia Astronautica. Archived from the original on 9 July 2012. Retrieved 23 May 2009.
Wade, Mark. "Kosmos 2". Encyclopedia Astronautica. Archived from the original on 18 June 2012. Retrieved 23 May 2009.
Wade, Mark. "DS". Encyclopedia Astronautica. Archived from the original on 31 March 2009. Retrieved 23 May 2009.