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\bibitem{Marazita_etal1999} Marazita, Seven M., Kai Hui, Hesler, J. L., Bishop, W. L., \& Crowe, T. W. (1999). Progress in submillimeter wavelength integrated mixer technology. In \textit{Proc. 10$^{th}$ Int. Symp. Space Terahertz Technol.} (74). Charlottesville, Virginia.

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