(1)
Kirm, M.; Kisand, V.; Sombrowski, E.; Steeg, B.; Vielhauer, S.; Zimmerer, G. Prompt and Delayed Secondary Excitons in Rare Gas Solids: Spectroscopy in Cryocrystals and Matrices. Fiz. Nizk. Temp. 2003, 29, 1081-1092.