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\bibitem{Kawamura_etal1998} Kawamura, J., Blundell, R., Tong, C. - Y. E., Papa, D. C., Hunter, T. R., Gol{\textquoteright}tsman, G., et al. (1998). First light with an 800 GHz phonon-cooled HEB mixer receiver. In \textit{Proc. 9$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 35--43). Pasadena, California, USA.

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