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WikiPedia: Đồng hồ 12 giờ http://members.aon.at/sundials/berlin-egypte.htm http://www.math.csusb.edu/faculty/susan/number_bra... http://buscon.rae.es/dpdI/SrvltGUIBusDPD?lema=hora... http://physics.nist.gov/GenInt/Time/early.html http://www.arcytech.org/java/clock/clock_history.h... https://www.nist.gov/pml/time-and-frequency-divisi... https://web.archive.org/web/20061115233642/http://... https://web.archive.org/web/20080531063139/http://... https://web.archive.org/web/20080704121745/http://... https://web.archive.org/web/20081013135550/http://...