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\bibitem{Gershenzon_etal1990} Gershenzon, E. M., Gershenzon, M. E., Goltsman, G. N., Lulkin, A., Semenov, A. D., \& Sergeev, A. V. (1990). Electron-phonon interaction in ultrathin Nb films. \textit{Sov. Phys. JETP}, \textit{70}(3), 505--511.

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