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

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