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\bibitem{Beck_etal2012} Beck, M., Leiderer, P., Kabanov, V. V., Gol{\textquoteright}tsman, G., Helm, M., \& Demsar, J. (2012). Energy-gap dynamics of a superconductor NbN studied by time-resolved terahertz spectroscopy. In \textit{INIS} (Vol. 45, pp. 1--3).

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