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\bibitem{Cherednichenko_etal2005} Cherednichenko, S., Kollberg, E., Angelov, I., Drakinskiy, V., Berg, T., \& Merkel, H. (2005). Effect of the direct detection effect on the HEB receiver sensitivity calibration. In \textit{Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 235--239). G{\"o}teborg, Sweden.

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