Diddams, S.
, Hollberg, L.
, Ma, L.
and Robertsson, L.
(2002),
Femtosecond-Laser-Based Optical Clockwork with Instability < 6.3 × 10<sup>-16</sup> in 1 s, Optics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=104897
(Accessed October 10, 2024)