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\bibitem{Chen_etal2008} Chen, J., Kang, L., Jin, B. B., Xu, W. W., Wu, P. H., Zhang, W., et al. (2008). Properties of terahertz superconducting hot electron bolometer mixers. \textit{Int. J. Terahertz Sci. Technol.}, \textit{1}(1), 37--41.

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