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\bibitem{Guerrero_etal2015} {\textquotedblleft}\textit{Shelf life degradation of bulk heterojunction solar cells : intrinsic evolution of charge transfer complex}{\textquotedblright}. Guerrero A, Heidari H, Ripolles TS, Kovalenko A, Pfannm{\"o}ller M, Bals S, Kauffmann L-D, Bisquert J, Garcia-Belmonte G, Laser physics review \textbf{5}, 1401997 (2015).   http://doi.org/10.1002/aenm.201401997

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