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M. Kirm, V. Kisand, E. Sombrowski, B. Steeg, S. Vielhauer, and G. Zimmerer, Prompt and delayed secondary excitons in rare gas solids: Spectroscopy in Cryocrystals and Matrices, Low Temp. Phys. 29, (2003) [Fiz. Nizk. Temp. 29, 1081-1092, (2003)] DOI: https://doi.org/10.1063/1.1619352.