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}}</ref> This suggests that the statistical uncertainties and best estimate for {{sfrac|{{math|Δ''α''}} | {{mvar|α}} }} stated by Webb ''et al.'' and Murphy ''et al.'' are robust.
Lamoreaux and Torgerson analyzed data from the [[Oklo]] [[natural nuclear fission reactor]] in 2004, and concluded that {{mvar|α}} has changed in the past 2 billion years by 45 parts per billion. They claimed that this finding was "probably accurate to within 20%". Accuracy is dependent on estimates of impurities and temperature in the natural reactor. These conclusions have yet to be verified.<ref>
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