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ndTeology.1999:109. Bir,ByronE.编,NBSMonograph140:TimeandFrequency:TheoryandFualsPDF:8,May1974 McCarthy,DennisD.;Seidelmann,P.Keime:FromEarthRotationtoAtomicPhysicssed.Forprovisionallimiteduse,theC1966approved"SteppedAtomicTime,"whichusedtheatomicsedwithfrequent200msadjustmentsmadeiobewithin0.1sofUT2. Gambis,Daniel.BulletinC36.Paris:IERSEOPPC,ObservatoiredeParis.2008-07-04[2010-04-18].原始内容存档於2009-10-06. Ahompson.2008WillBeJustaSedLonger.LiveSce.2008-12-08[2008-12-29].原始内容存档於2008-12-12. IionalTeleunicationsUnionRadiounicatioorreendationTF.460-6:Standard-frequendtime-signalemissions.[2017-02-09].原始内容存档於2016-10-17. SteveAllerapotionsofthediffereI–UT1.