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S. Sheludiakov, D.M. Lee, V.V. Khmelenko, J. Ahokas, J. Järvinen, and S. Vasiliev, Studies of nuclear polarization of hydrogen atoms embedded in solid molecular hydrogen and hydrogen deuteride films, Low Temp. Phys. 46, (2019) [Fiz. Nizk. Temp. 46, 172-179, (2019)] DOI: https://doi.org/10.1063/10.0000532.