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\bibitem{Gershenzon_etal1991} Gershenzon, E. M., Gogidze, I. G., Goltsman, G. N., Semenov, A. D., \& Sergeev, A. V. (1991). Picosecond response on optical-range emission in thin YBaCuO films. \textit{Pisma v Zhurnal Tekhnicheskoi Fiziki}, \textit{17}(22), 6--10.

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