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\bibitem{Tong_etal2003} Tong, C. - Y. E., Meledin, D., Blundell, R., Erickson, N., Kawamura, J., Mehdi, I., et al. (2003). A 1.5 THz hot-electron bolometer mixer operated by a planar diode-based local oscillator. In \textit{Proc. 14$^{th}$ Int. Symp. Space Terahertz Technol.} (286).

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