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N.N. Kleshchina, I.S. Kalinina, R. Lambo, A.A. Buchachenko, D.S. Bezrukov, and S.-M. Hu, Triplet emission of atomic ytterbium isolated in a xenon matrix, Low Temp. Phys. 45, (2019) [Fiz. Nizk. Temp. 45, 827-835, (2019)] DOI: https://doi.org/10.1063/1.5111293.