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A. Drobyshev, A. Aldiyarov, D. Sokolov, and A. Shinbayeva, Refractive indices and density of cryovacuum-deposited thin films of methane in the vicinity of the α–β-transition temperature, Low Temp. Phys. 43, (2017) [Fiz. Nizk. Temp. 43, 909-913, (2017)] DOI: https://doi.org/10.1063/1.4985981.