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\bibitem{VanOijstaeijen_etal2020} {\textquotedblleft}\textit{Urban green infrastructure: A review on valuation toolkits from an urban planning perspective}{\textquotedblright}. Van Oijstaeijen W, Van Passel S, Cools J, Journal Of Environmental Management \textbf{267}, 110603 (2020).   http://doi.org/10.1016/j.jenvman.2020.110603

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