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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. Thickness dependence of superconducting properties of ultrathin Nb and NbN films. In: AKF-Fr{\"u}hjahrstagung.; 2004.

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