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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
2009 1
2012 1
2015 1
2017 1
2019 1
2020 1
2021 5
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Page 1
Optical-Clock-Based Time Scale.
Yao J, Sherman JA, Fortier T, Leopardi H, Parker T, McGrew W, Zhang X, Nicolodi D, Fasano R, Schäffer S, Beloy K, Savory J, Romisch S, Oates C, Diddams S, Ludlow A, Levine J. Yao J, et al. Among authors: schaffer s. Phys Rev Appl. 2019;12(4): Phys Rev Appl. 2019. PMID: 33102625 Free PMC article.