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\bibitem{Meledin_etal2009} Meledin, D., Pavolotsky, A., Desmaris, V., Lapkin, I., Risacher, C., Perez, V., et al. (2009). A 1.3-THz balanced waveguide HEB mixer for the APEX telescope. \textit{IEEE Trans. Microw. Theory Techn.}, \textit{57}(1), 89--98.

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