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\bibitem{Lindgren_etal1994} Lindgren, M., Zorin, M. A., Trifonov, V., Danerud, M., Winkler, D., Karasik, B. S., et al. (1994). Optical mixing in a patterned YBa$_{2}$Cu$_{3}$O$_{7-δ}$ thin film. \textit{Appl. Phys. Lett.}, \textit{65}(26), 3398--3400.

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