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\bibitem{Kerr_etal1997} Kerr, A. R., Feldman, M. J., \& Pan, S. - K. (1997). Receiver noise temperature, the quantum noise limit, and zero{\textendash}point fluctuations. In \textit{Proc. 8$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 101--111).

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