Сония
Сония (ар.
Нигаред
Сарчашма
- National Physical Laboratory: Trapped ion optical frequency standards Бойгонӣ шудааст 14 феврали 2009 сол.
- High-accuracy strontium ion optical clock; National Physical Laboratory (2005)
- National Research Council of Canada: Optical frequency standard based on a single trapped ion Бойгонӣ шудааст 14 марти 2008 сол.
- NIST: Definition of the second; notice the cesium atom must be in its ground state at 0 K
- Official BIPM definition of the second
- Seconds and leap seconds by the USNOБойгонӣ шудааст 11 июни 2012 сол.
- The leap second: its history and possible future
- What is a Cesium atom clock? Бойгонӣ шудааст 20 феврали 2009 сол.
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