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\bibitem{Ilin_etal2004} Il{\textquoteright}in, K., Siegel, M., Semenov, A., Engel, A., H{\"u}bers, H. - W., Hollmann, E., et al. (2004). Thickness dependence of superconducting properties of ultrathin Nb and NbN films. In \textit{AKF-Fr{\"u}hjahrstagung}.

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