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\bibitem{Eijt_etal2017} {\textquotedblleft}\textit{New insights into the nanostructure of innovative thin film solar cells gained by positron annihilation spectroscopy}{\textquotedblright}. Eijt SWH, Shi W, Mannheim A, Butterling M, Schut H, Egger W, Dickmann M, Hugenschmidt C, Shakeri B, Meulenberg RW, Callewaert V, Saniz R, Partoens B, Barbiellini B, Bansil A, Melskens J, Zeman M, Smets AHM, Kulbak M, Hodes G, Cahen D, Br{\"u}ck E, Journal of physics : conference series \textbf{791}, 012021 (2017).   http://doi.org/10.1088/1742-6596/791/1/012021

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