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A strontium optical lattice clock with $1 \times 10^{-17}$ uncertainty and measurement of its absolute frequency. (arXiv:2005.10857v1 [physics.atom-ph]) http://arxiv.org/abs/2005.10857
A strontium optical lattice clock with $1 \times 10^{-17}$ uncertainty and measurement of its absolute frequency. (arXiv:2005.10857v1 [physics.atom-ph]) http://arxiv.org/abs/2005.10857