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\bibitem{Fetterman_etal1978} Fetterman, H. R., Tannenwald, P. E., Clifton, B. J., Parker, C. D., Fitzgerald, W. D., \& Erickson, N. R. (1978). Far-ir heterodyne radiometric measurements with quasioptical Schottky diode mixers. \textit{Appl. Phys. Lett.}, \textit{33}(2), 151--154.

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