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\bibitem{Meledin_etal2002} Meledin, D., Tong, C. Y. - E., Blundell, R., Kaurova, N., Smirnov, K., Voronov, B., et al. (2002). The sensitivity and IF bandwidth of waveguide NbN hot electron bolometer mixers on MgO buffer layers over crystalline quartz. In Harvard university (Ed.), \textit{Proc. 13$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 65--72). Cambridge, MA, USA.

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