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\bibitem{Maslennikov_etal2006} Maslennikov SN, Finkel MI, Antipov SV, Polyakov SL, Zhang W, Ozhegov R, et al. Spiral antenna coupled and directly coupled NbN HEB mixers in the frequency range from 1 to 70 THz. In: Proc. 17$^{th}$ Int. Symp. Space Terahertz Technol. Paris, France; 2006. p. 177--9.

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