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A.N. Ponomaryov, E.V. Savchenko, G.B. Gumenchuk, I.V. Khizhniy, M. Frankowski, and V.E. Bondybey, Thermoactivation spectroscopy of solid Ar doped with N2: Electronic Processes in Cryocrystals, Low Temp. Phys. 33, (2007) [Fiz. Nizk. Temp. 33, 705-710, (2007)] DOI: https://doi.org/10.1063/1.2746245.