Ludlow, A.
, Hinkley, N.
, Sherman, J.
, Phillips, N.
, Schioppo, M.
, Lemke, N.
, Beloy, K.
, Pizzocaro, M.
and Oates, C.
(2013),
An atomic clock with 10<sup>-18</sup> instability, Science, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=914109
(Accessed December 6, 2024)