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\bibitem{Zorin_etal1995} Zorin, M., Gol{\textquoteright}tsman, G. N., Karasik, B. S., Elantev, A. I., Gershenzon, E. M., Lindgren, M., et al. (1995). Optical mixing in thin YBa$_{2}$Cu$_{3}$O$_{7-x}$ films. \textit{IEEE Trans. Appl. Supercond.}, \textit{5}(2), 2431--2434.

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