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\bibitem{Gao_etal2005} Gao, J. R., Hovenier, J. N., Yang, Z. Q., Baselmans, J. J. A., Baryshev, A., Hajenius, M., et al. (2005). Terahertz heterodyne receiver based on a quantum cascade laser and a superconducting bolometer. \textit{Appl. Phys. Lett.}, \textit{86}, 244104 (1 to 3).

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