Rosenband, T.
, Hume, D.
, Brusch, A.
, Lorini, L.
, Schmidt, P.
, Fortier, T.
, Stalnaker, J.
, Diddams, S.
, Newbury, N.
, Swann, W.
, Oskay, W.
, Itano, W.
, Wineland, D.
and Bergquist, J.
(2007),
Frequency Comparison of Al<sup>+</sup> and Hg<sup>+</sup> Optical Standards, Proc. 2007 ICOLS Meeting, Telluride, CO, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50640
(Accessed October 31, 2024)