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\bibitem{Baubert_etal2003} Baubert J, Salez M, Delorme Y, Pons P, Goltsman G, Merkel H, et al. Membrane-based HEB mixer for THz applications. In: Chiao J-C, Varadan VK, Can{\'e} C, editors. Proc. SPIE. Vol 5116. SPIE; 2003. p. 551--62.

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