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space tug services in low Earth orbit (LEO), would be commercially profitable and reduce transportation costs to geosynchronous orbit by as much as 44%
ISRO to launch PSLV-C16 with RESOURCESAT-2, two other satellites on Apr 20 | NetIndian. Netindian.in. 9 April 2011 [27 March 2012]. （原始内容存档于2025-01-18）.
[2020-07-16]. （原始内容存档于2020-07-25）. in the case of the estimates sent broadcast by the Department of Agriculture, in its latest annual report, the extent
Patent 6,116,545, "Free return lunar flyby transfer method for geosynchronous satellites", Filed April 9, 1998. Salvatore, Jeremiah O. and Ocampo, Cesar
15 June 2010 [15 June 2010]. （原始内容存档于17 June 2010）. Prisma Satellites To Be Launched In June 2009. Space-Travel.com. 25 April 2008 [27 September 2008]