^ http://www.ontology-of-units-of-measure.org/resource/om-2/_9192631770PeriodsOfTheRadiationCorrespondingToTheTransitionBetweenTheTwoHyperfineLevelsOfTheGroundStateOfTheCesium133Atom

9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom

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