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\bibitem{Buffiere_etal2014} {\textquotedblleft}\textit{Microstructural analysis of 9.7\% efficient Cu$_{2}$ZnSnSe$_{4}$ thin film solar cells}{\textquotedblright}. Buffi{\`e}re M, Brammertz G, Batuk M, Verbist C, Mangin D, Koble C, Hadermann J, Meuris M, Poortmans J, Applied physics letters \textbf{105}, 183903 (2014).   http://doi.org/10.1063/1.4901401

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