Sullivan, D.
(2002),
What is the Basis for the Definition of the Second?, Scientific American, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105572
(Accessed May 14, 2025)
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What is the Basis for the Definition of the Second?
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Created January 1, 2002, Updated February 19, 2017