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\bibitem{Merkel_etal1999} Merkel, H., Khosropanah, P., Yagubov, P., \& Kollberg, E. (1999). A hot spot mixer model for superconducting phonone{\textendash}cooled HEB far above the quasipartical band gap. In \textit{Proc. 10$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 592--606). Charlottesville, Virginia.

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