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\bibitem{Beck_etal2013} Beck, M., Rousseau, I., Klammer, M., Leiderer, P., Mittendorff, M., Winnerl, S., et al. (2013). Transient increase of the energy gap of superconducting NbN thin films excited by resonant narrow-band terahertz pulses. \textit{Phys. Rev. Lett.}, \textit{110}(26), 267003 (1 to 5).

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