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line of nodes, entry in The Encyclopedia of Astrobiology, Astronomy, and Spaceflight, David Darling, on line, accessed May 17, 2007.
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nodeArchived 2007년 3월 9일 - 웨이백 머신, entry in The Columbia Encyclopedia, 6th ed., New York: Columbia University Press, 2001–04. Accessed on line May 17, 2007.