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Yu.A. Freiman, Alexei Grechnev, S.M. Tretyak, Alexander F. Goncharov, and Russell J. Hemley, Sound velocities in solid hydrogen under pressure, Low Temp. Phys. 39, (2013) [Fiz. Nizk. Temp. 39, 548-551, (2013)] DOI: https://doi.org/10.1063/1.4807043.