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\bibitem{Merkel_etal1998} Merkel, H. F., Yagoubov, P. A., Kroug, M., Khosropanah, P., Kollberg, E. L., Gol{\textquoteright}tsman, G. N., et al. (1998). Noise temperature and absorbed LO power measurement methods for NbN phonon-cooled hot electron bolometric mixers at terahertz frequencies. In \textit{Proc. 28th European Microwave Conf.} (Vol. 1, pp. 294--299).

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