TY  - GEN
AU  - Rosenband,T
AU  - Hume,D B
AU  - Schmidt,P O
AU  - Chou,C W
AU  - Brusch,A
AU  - Lorini,L
AU  - Oskay,W H
AU  - Drullinger,R E
AU  - Fortier,T M
AU  - Stalnaker,J E
AU  - Diddams,S A
AU  - Swann,W C
AU  - Newbury,N R
AU  - Itano,W M
AU  - Wineland,D J
AU  - Bergquist,J C
TI  - Frequency ratio of Al+ and Hg+ single-ion optical clocks; metrology at the 17th decimal place
SN  - 1095-9203
PY  - 2008///0409
N1  - Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S
UR  - https://doi.org/10.1126/science.1154622
ER  -