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\bibitem{Nasr_etal2008} Nasr, M. B., Minaeva, O., Goltsman, G. N., Sergienko, A. V., Saleh, B. E., \& Teich, M. C. (2008). Submicron axial resolution in an ultrabroadband two-photon interferometer using superconducting single-photon detectors. \textit{Opt. Express}, \textit{16}(19), 15104--15108.

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