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\bibitem{Baryshev_etal2005} Baryshev A, Baselmans JJA, Reker SF, Hajenius M, Gao JR, Klapwijk TM, et al. Direct detection effect in hot electron bolometer mixers [abstract]. In: Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.; 2005. p. 463--4.

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