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WikiPedia: Thời gian biểu phát hiện các hành tinh và vệ tinh trong Hệ Mặt Trời http://www.cosmovisions.com/SaturneChrono02.htm http://books.google.com/?id=OwOlRPbrZeQC&pg=PA153&... http://www.hudsonfla.com/space.htm http://www.skyandtelescope.com/news/Neptunes-Newes... http://www.solarviews.com/cap/jup/adraste2.htm http://www.gps.caltech.edu/~mbrown/planetlila/ http://www.gps.caltech.edu/~mbrown/planetlila/moon... http://icarus.cornell.edu/journal/ToC/1996/content... http://www.physics.emich.edu/jwooley/chapter9/Chap... http://adsabs.harvard.edu//full/seri/AJ.../0002//0...