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\bibitem{Daniels_etal2017} {\textquotedblleft}\textit{Monetary valuation of natural predators for biological pest control in pear production}{\textquotedblright}. Daniels S, Witters N, Beli{\"e}n T, Vrancken K, Vangronsveld J, Van Passel S, Ecological Economics \textbf{134}, 160 (2017).   http://doi.org/10.1016/J.ECOLECON.2016.12.029

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