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\bibitem{Grieger_etal2020} Grieger, M., Hensel, T., Agramunt, J., Bemmerer, D., Degering, D., Dillmann, I., et al. (2020). Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated He-3 counters. \textit{Phys. Rev. D}, \textit{101}(12), 123027--15pp.

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