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\bibitem{Tong_etal2000} Tong, C. - Y. E., Kawamura, J., Todd, R. H., Papa, D. C., Blundell, R., Smith, M., et al. (2000). Successful operation of a 1 THz NbN hot-electron bolometer receiver. In \textit{Proc. 11$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 49--59).

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