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\bibitem{Freitas_etal2010} Freitas, E. D. C., Monteiro, C. M. B., Ball, M., Gomez-Cadenas, J. J., Lopes, J. A. M., Lux, T., et al. (2010). Secondary scintillation yield in high-pressure xenon gas for neutrinoless double beta decay (0 nu beta beta) search. \textit{Phys. Lett. B}, \textit{684}(4-5), 205--210.

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