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\bibitem{Chattopadhyay_etal1999} Chattopadhyay, G., Rice, F., Miller, D., LeDuc, H. G., \& Zmuidzinas, J. (1999). A 530-GHz balanced mixer. \textit{IEEE Microw. and Guided Wave Lett.}, \textit{9}(11), 467--469.

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