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\bibitem{Loudkov_etal2005} Loudkov, D., Tong, C. - Y. E., Marrone, D. P., Ryabchun, S., Paine, S. N., \& Blundell, R. (2005). Transmission measurements of infrared filters for low-noise terahertz receiver applications. In \textit{Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 354--357).

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