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V.F. Machulin, F.V. Motsnyi, E.Yu. Peresh, O.M. Smolanka, and G.S. Svechnikov, Effect of temperature variation on shift and broadening of exciton band in Cs3Bi2I9 layered crystals, Low Temp. Phys. 30, (2004) [Fiz. Nizk. Temp. 30, 1283-1286, (2004)] DOI: https://doi.org/10.1063/1.1820036.