Steven Chu, Achim Peters, Keng Yeow Chung: Measurement of gravitational acceleration by dropping atoms. In: Nature. 1999, 400, S. 849–852, doi:10.1038/23655.
T.L. Nicholson, S.L. Campbell, R.B. Hutson, G.E. Marti, B.J. Bloom, R.L. McNally, W. Zhang, M.D. Barrett, M.S. Safronova, G.F. Strouse, W.L. Tewn J. Ye: Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty. In: Nature Communications. 2015, 6, doi:10.1038/ncomms7896
