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Zhang, S. Y., J. T. Wu, Y. L. Zhang, J. X. Leng, W. P. Yang, Z. G. Zhang, and J. Y. Zhao. "Direct Frequency Comb Optical Frequency Standard Based On Two-photon Transitions of Thermal Atoms." Sci Rep 2015.

Zhang, S. Y., et al. "Direct Frequency Comb Optical Frequency Standard Based On Two-photon Transitions of Thermal Atoms." Sci Rep 2015.