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2017‑06‑19 – A historical review of US contributions to the atomic redefinition of the SI second in 1967.

• 2017‑06‑19 - A historical review of US contributions to the atomic redefinition of the SI second in 1967.
• http://tf.boulder.nist.gov/general/pdf/2917.pdf
• redirect https://dotat.at/:/Y6HXA
• blurb https://dotat.at/:/Y6HXA.html
• atom entry https://dotat.at/:/Y6HXA.atom
• web.archive.org archive.today