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\bibitem{Heslinga_etal1994} Heslinga, D. R., Shafranjuk, S. E., van Kempen, H., \& Klapwijk, T. M. (1994). Observation of double-gap-edge Andreev reflection at Si/Nb interfaces by point-contact spectroscopy. \textit{Phys. Rev. B}, \textit{49}(15), 10484--10494.

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