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\bibitem{Aksaev_etal1989} Aksaev, E. E., Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., Semenov, A. D., \& Sergeev, A. V. (1989). Interaction of electrons with thermal phonons in YBa$_{2}$Cu$_{3}$O$_{7-δ}$ films at low temperatures. \textit{JETP Lett.}, \textit{50}(5), 283--286.

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