Tanya
Zelevinsky
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Campbell, G. K., Ludlow, A. D., Blatt, S. ., Thomsen, J. W., Martin, M. J., de Miranda, M. H. G., … Jefferts, S. R. (2008). The absolute frequency of the 87Sr optical clock transition. Metrologia, 45(5), 539–548. http://doi.org/10.1088/0026-1394/45/5/008