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\bibitem{Sergeev_etal1994} Sergeev, A. V., Semenov, A. D., Kouminov, P., Trifonov, V., Goghidze, I. G., Karasik, B. S., et al. (1994). Transparency of a YBa2Cu3O7-film/substrate interface for thermal phonons measured by means of voltage response to radiation. \textit{Phys. Rev. B Condens. Matter.}, \textit{49}(13), 9091--9096.

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