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\bibitem{Meledin_etal2003} Meledin, D., Tong, C. Y. - E., Blundell, R., Kaurova, N., Smirnov, K., Voronov, B., et al. (2003). Study of the IF bandwidth of NbN HEB mixers based on crystalline quartz substrate with an MgO buffer layer. \textit{IEEE Trans. Appl. Supercond.}, \textit{13}(2), 164--167.

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