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\bibitem{Hesler_etal1996} Hesler, J. L., Hall, W. R., Crowe, T. W., Weikle, R. M., Bradley, R. F., \& Pan, S. - K. (1996). Submm wavelenght waveguide mixers using planar Schottky barier diods. In \textit{Proc. 7$^{th}$ Int. Symp. Space Terahertz Technol.} (462).

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