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\bibitem{Usmani_etal2012} Usmani, I., Clausen, C., Bussi{\`e}res, F., Sangouard, N., Afzelius, M., \& Gisin, N. (2012). Heralded quantum entanglement between two crystals. \textit{Nat. Photon.}, \textit{6}(4), 234--237.

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