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\bibitem{Smirnov_etal2008} Smirnov, A. V., Larionov, P. A., Finkel, M. I., Maslennikov, S. N., Voronov, B. M., \& Gol{\textquoteright}tsman, G. N. (2008). NbZr films for THz phonon-cooled HEB mixers. In \textit{Proc. 19$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 44--47). Groningen, Netherlands.

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