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A.M. Kosevich, S.B. Feodosyev, I.A. Gospodarev, V.I. Grishaev, O.V. Kotlyar, V.O. Kruglov, E.V. Manzhelii, and E.S. Syrkin, Evolution of discrete local levels into an impurity band in solidified inert gas solution: Classical Cryocrystals, Low Temp. Phys. 33, (2007) [Fiz. Nizk. Temp. 33, 735-740, (2007)] DOI: https://doi.org/10.1063/1.2746251.