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\bibitem{deLange_etal2008} de Lange, G., Krieg, J. - M., Honingh, N., Karpov, A., \& Cherednichenko, S. (2008). Performance of the HIFI flight mixers. In \textit{Proc. 19$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 98--105).

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