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Rescuing 4 sources and submitting 0 for archiving.) #IABot (v2.0
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Red 21:
*[http://www.bipm.org/en/si/si_brochure/chapter2/2-1/second.html BIPM Cesium ion f<sub>Cs</sub> definition]
*[https://web.archive.org/web/20090517092215/http://inms-ienm.nrc-cnrc.gc.ca/research/frequency_time_projects_e.html#gen National Research Council of Canada: ''Generation of the Hz'']
*[https://web.archive.org/web/20090312014651/http://inms-ienm.nrc-cnrc.gc.ca/research/cesium_clock_e.html National Research Council of Canada: ''Cesium fountain clock'']
*[https://web.archive.org/web/20090214020937/http://www.npl.co.uk/server.php?show=ConWebDoc.1086 National Physical Laboratory: ''Trapped ion optical frequency standards'' ]
*[https://web.archive.org/web/20080314011450/http://inms-ienm.nrc-cnrc.gc.ca/research/optical_frequency_projects_e.html#optical National Research Council of Canada: ''Optical frequency standard based on a single trapped ion'']