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\bibitem{Tong_etal2003} Tong, C. - Y. E., Meledin, D., Loudkov, D., Blundell, R., Erickson, N., Kawamura, J., et al. (2003). A 1.5 THz Hot-Electron Bolometer mixer operated by a planar diode based local oscillator. In \textit{IEEE MTT-S Int. Microwave Symp. Digest} (Vol. 2, pp. 751--754).

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