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\bibitem{Kawamura_etal1996} Kawamura J, Blundell R, Tong C-YE, Golts{\textquoteright}man G, Gershenzon E, Voronov B. Superconductive NbN hot-electron bolometric mixer performance at 250 GHz. In: Proc. 7$^{th}$ Int. Symp. Space Terahertz Technol.; 1996. p. 331--6.

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