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Zhang 张, S. et al. (n.d.). A 420 nm Blue Diode Laser for the Potential Rubidium Optical Frequency Standard *Supported by the China Academy of Space Technology Foundation under Grant No CAST-2015-5-10, the National Hi-Tech Research and Development Program, and the National Natural Science Foundation of China under Grant No 91436210.. Chinese physics letters. p. . [Online].