সেকেন্ড: সংশোধিত সংস্করণের মধ্যে পার্থক্য

* [http://www.cl.cam.ac.uk/~mgk25/time/metrologia-leapsecond.pdf The leap second: its history and possible future]

* [https://web.archive.org/web/20090220155423/http://inms-ienm.nrc-cnrc.gc.ca/faq_time_e.html#10 ''What is a Cesium atom clock?'']

 

{{Time measurement and standards}}