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V.V. Khmelenko, I.N. Krushinskaya, R.E. Boltnev, I.B. Bykhalo, A.A. Pelmenev, and D.M. Lee, Dynamics of thermoluminescence spectra of impurity-helium condensates containing stabilized nitrogen and oxygen atoms, Low Temp. Phys. 38, (2012) [Fiz. Nizk. Temp. 38, 871-883, (2012)] DOI: https://doi.org/10.1063/1.4745675.