Rosenband, T <br/><br/>
Frequency ratio of Al+ and Hg+ single-ion optical clocks; metrology at the 17th decimal place.  [electronic resource] 

 -  Science (New York, N.Y.)  Mar 2008 
 - 1808-12 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. 
<br/><br/><label>ISSN: </label>1095-9203 
<br/><br/><label>Standard No.: </label>10.1126/science.1154622  doi