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Yu. Pashkevich, E. Pomjakushina, S. Gnatchenko, D. Wulferding, K. Lamonova, A. Gusev, T. Shevtsova, P. Lemmens, V. Gnezdilov, and K. Conder, Phase separation in iron chalcogenide superconductor Rb0.8+xFe1.6+ySe2 as seen by Raman light scattering and band structure calculations, Low Temp. Phys. 42, (2016) [Fiz. Nizk. Temp. 42, 628-643, (2016)] DOI: https://doi.org/10.1063/1.4954780 .