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\bibitem{Merkel_etal2001} Merkel, H. F., Khosropanah, P., Sigfrid Yngvesson, K., Cherednichenko, S., Kroug, M., Adam, A., et al. (2001). An active zone small signal model for hot-electron bolometric mixers. In \textit{Proc. 12$^{th}$ Int. Symp. Space Terahertz Technol.} (55). San Diego, CA, USA.

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