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58",Phys.EarthPer.,No.44,pp.281–292

    RANelson,DDMcCarthy,SMalys,JLevine,BGuinot,HFFliegel,RLBeard,andTRBartholomew,2001"TheLeapSed:itsHistoryandPossibleFuture"2001,Metrologia38,pp.509–529

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