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\bibitem{BenDkhil_etal2017} {\textquotedblleft}\textit{Toward high-temperature stability of PTB7-based bulk heterojunction solar cells : impact of fullerene size and solvent additive}{\textquotedblright}. Ben Dkhil S, Pfannm{\"o}ller M, Saba MI, Gaceur M, Heidari H, Videlot-Ackermann C, Margeat O, Guerrero A, Bisquert J, Garcia-Belmonte G, Mattoni A, Bals S, Ackermann J, Laser physics review \textbf{7}, 1601486 (2017).   http://doi.org/10.1002/AENM.201601486

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