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WikiPedia: Con lắc http://www.17centurymaths.com/contents/huygens/hor... http://www.17centurymaths.com/contents/huygenscont... http://excelunusual.com/archive/2010/09/pendulum/ http://books.google.com/?id=Lx0v2dhnZo8C&pg=PA27 http://www.juliantrubin.com/bigten/foucaultpendulu... http://www.oldandsold.com/articles02/clocks-r.shtm... http://www.sciencemaster.com/space/item/helio_4.ph... http://scienceworld.wolfram.com/physics/Pendulum.h... http://adsabs.harvard.edu/abs/1986AmJPh..54..112N http://adsabs.harvard.edu/abs/2004PhT....57b..13N