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\bibitem{Meledin_etal2005} Meledin, D., Pantaleev, M., Pavolotsky, A., Risacher, C., Belitsky, V., Drakinskiy, V., et al. (2005). Balanced waveguide HEB mixer for APEX 1.3 THz receiver. In \textit{Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.}. G{\"o}teborg, Sweden.

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