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A.A. Pelmenev, I.B. Bykhalo, I.N. Krushinskaya, and R.E. Boltnev, Studies of charging mechanisms in impurity-helium condensates by means of impedance spectroscopy and current spectroscopy, Low Temp. Phys. 45, (2019) [Fiz. Nizk. Temp. 45, 318-324, (2019)] DOI: https://doi.org/10.1063/1.5090040.