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\bibitem{Buffiere_etal2015} {\textquotedblleft}\textit{KCN chemical etch for interface engineering in Cu$_{2}$ZnSnSe$_{4}$ solar cells}{\textquotedblright}.  Buffi{\`e}re M, Brammertz G, Sahayaraj S, Batuk M, Khelifi S, Mangin D, El Mel AA, Arzel L, Hadermann J, Meuris M, Poortmans J;, ACS applied materials and interfaces \textbf{7}, 14690 (2015).   http://doi.org/10.1021/acsami.5b02122

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