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\bibitem{Guerrero_etal2015} {\textquotedblleft}\textit{Nanoscale mapping by electron energy-loss spectroscopy reveals evolution of organic solar cell contact selectivity}{\textquotedblright}. Guerrero A, Pfannm{\"o}ller M, Kovalenko A, Ripolles TS, Heidari H, Bals S, Kaufmann L-D, Bisquert J, Garcia-Belmonte G, Organic electronics: physics, materials, applications \textbf{16}, 227 (2015).   http://doi.org/10.1016/j.orgel.2014.11.007

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