New limits on coupling of fundamental constants to gravity using 87Sr optical lattice clocks.
Blatt S, Ludlow AD, Campbell GK, Thomsen JW, Zelevinsky T, Boyd MM, Ye J, Baillard X, Fouché M, Le Targat R, Brusch A, Lemonde P, Takamoto M, Hong FL, Katori H, Flambaum VV.
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Phys Rev Lett. 2008 Apr 11;100(14):140801. doi: 10.1103/PhysRevLett.100.140801. Epub 2008 Apr 9.
Phys Rev Lett. 2008.
PMID: 18518019