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S. V. Lubenets, L. S. Fomenko, and H. V. Rusakova, Characterization of the hydroextruded oxygen-free copper via microindentation in the temperature range 77–300 K, Low Temp. Phys. 48, 570–575, (2022) [Fiz. Nyzk. Temp. 48, 641-647, (2022)] DOI: https://doi.org/10.1063/10.0011606.