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\bibitem{Lobanov_etal2009} Lobanov, Y., Tong, C., Blundell, R., \& Gol{\textquoteright}tsman, G. (2009). A study of direct detection effect on the linearity of hot electron bolometer mixers. In \textit{Proc. 20$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 282--287).

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