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\bibitem{Lindgren_etal1994} Lindgren M, Zorin MA, Trifonov V, Danerud M, Winkler D, Karasik BS, et al. Optical mixing in a patterned YBa$_{2}$Cu$_{3}$O$_{7-δ}$ thin film. Appl Phys Lett. 1994;65(26):3398--400.

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