S R Jefferts

Testing the stability of fundamental constants with the 199Hg+ single-ion optical clock.

W M Itano, S A Diddams, L Hollberg, 2003, Physical review letters.

Testing local position invariance with four cesium-fountain primary frequency standards and four NIST hydrogen masers.

N Ashby, N. Ashby, T. Parker, 2007, Physical review letters.

Spin-1/2 optical lattice clock.

C W Oates, Z. Barber, S. Diddams, 2009, Physical review letters.

Precision atomic spectroscopy for improved limits on variation of the fine structure constant and local position invariance.

N Ashby, F Levi, N. Ashby, 2007, Physical review letters.

Single-atom optical clock with high accuracy.

F Levi, L. Hollberg, W. Itano, 2006, Physical review letters.