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Red 25:
*[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'']
*[http://inms-ienm.nrc-cnrc.gc.ca/research/optical_frequency_projects_e.html#femtosecond National Research Council of Canada: ''Optical frequency comb'']
* [http://www.wolframalpha.com/input/?i=1Hz Wolframalpha, upit: 1 Hz]
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