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\bibitem{Brammertz_etal2015} {\textquotedblleft}\textit{Investigation of properties limiting efficiency in Cu$_{2}$ZnSnSe$_{4}$-based solar cells}{\textquotedblright}.  Brammertz G, Oueslati S, Buffiere M, Bekaert J, El Anzeery H, Messaoud KB, Sahayaraj S, Nuytten T, Koble C, Meuris M, Poortmans J;, IEEE journal of photovoltaics \textbf{5}, 649 (2015).   http://doi.org/10.1109/JPHOTOV.2014.2376053

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