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\bibitem{Boiron_etal2015} Boiron, D., Fabbri, A., Larre, P. E., Pavloff, N., Westbrook, C. I., \& Zin, P. (2015). Quantum Signature of Analog Hawking Radiation in Momentum Space. \textit{Phys. Rev. Lett.}, \textit{115}(2), 025301--5pp.

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