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\bibitem{Lizin_etal2013} {\textquotedblleft}\textit{A patent landscape analysis for organic photovoltaic solar cells : identifying the technology{\textquoteright}s development phase}{\textquotedblright}. Lizin S, Leroy J, Delvenne C, Dijk M, De Schepper E, Van Passel S, Renewable Energy \textbf{57}, 5 (2013).   http://doi.org/10.1016/J.RENENE.2013.01.027

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