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Li Fang, Xiaoyu Chen, Xiaole Shen, Yifei Liu, D. M. Lindsay, and John R. Lombardi, Spectroscopy of yttrium dimers in argon matrices: Low-Temperature Physics and Chemistry in Cryomatrice, Low Temp. Phys. 26, (2000) [Fiz. Nizk. Temp. 26, 1011-1015, (2000)] DOI: https://doi.org/10.1063/1.1312403.