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\bibitem{DeSchepper_etal2012} {\textquotedblleft}\textit{Combining photovoltaics and sound barriers : a feasibility study}{\textquotedblright}. De Schepper E, Van Passel S, Manca J, Thewys T, Renewable Energy \textbf{46}, 297 (2012).   http://doi.org/10.1016/J.RENENE.2012.03.022

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