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\bibitem{Conings_etal2016} {\textquotedblleft}\textit{A Universal Deposition Protocol for Planar Heterojunction Solar Cells with High Efficiency Based on Hybrid Lead Halide Perovskite Families}{\textquotedblright}. Conings B, Babayigit A, Klug M T, Bai S, Gauquelin N, Sakai N, Wang J T-W, Verbeeck J, Boyen H-G, Advanced materials \textbf{28}, 10701 (2016).   http://doi.org/10.1002/adma.201603747

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