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\bibitem{Ilin_etal1999} Il{\textquoteright}in KS, Gol{\textquoteright}tsman GN, Voronov BM, Sobolewski R. Characterization of the electron energy relaxation process in NbN hot-electron devices. In: Proc. 10$^{th}$ Int. Symp. Space Terahertz Technol.; 1999. p. 390--7.

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