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\bibitem{Ursin_etal2007} Ursin, R., Tiefenbacher, F., Schmitt-Manderbach, T., Weier, H., Scheidl, T., Lindenthal, M., et al. (2007). Entanglement-based quantum communication over 144km. \textit{Nat. Phys.}, \textit{3}(7), 481--486.

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