Ludlow, A.
, Boyd, M.
, Zelevinsky, T.
, Foreman, S.
, Blatt, S.
, Notcutt, M.
, Ido, T.
and Ye, J.
(2006),
Systematic study of the <sup>87</sup>Sr clock transition in an optical lattice, Physical Review Letters
(Accessed March 13, 2025)