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\bibitem{Tong_etal1997} Tong, C. Y. E., Chen, L., \& Blundell, R. (1997). Theory of distributed mixing and amplification in a superconductingquasi-particle nonlinear transmission line. \textit{IEEE Trans. Microw. Theory Techn.}, \textit{45}(7), 1086--1092.

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