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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 Stephenson,F.R.;Morrison,L.V.Long-termfluctuationsih''''srotation:700BCtoAD1990.PhilosophicalTransasoftheRoyalSocietyofLondonA.1995,3511695:165–202.Bibcode:1995RSPTA.351..165S.doi:10.1098/rsta.1995.0028. McCarthy,DD;Ha,elson,RA.ThePhysicalBasisoftheLeapSed.AstronomicalJournal.2008,1365:1906–1908.Bibcode:2008AJ....136.1906M.doi:10.1088/0004-6256/136/5/1906?. Jespersen,James;Fitz-Randolph,Jane.FromSundialsToAtomicClocks:UandingTimeandFrequencyPDF.NationalInstituteofStandardsa