Атомски часовник — разлика између измена
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* [https://web.archive.org/web/20050423205239/http://www.boulder.nist.gov/timefreq/service/its.htm NIST Internet Time Service (ITS): Set Your Computer Clock Via the Internet]
* [http://www.nist.gov/public_affairs/releases/miniclock.htm NIST press release about chip-scaled atomic clock]
* [
* [https://web.archive.org/web/20060412020336/http://www.sciencemuseum.org.uk/on-line/atomclocks/ Web pages on atomic clocks] by [[Science Museum (London)|The Science Museum (London)]]
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