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\bibitem{Biely_etal2019} {\textquotedblleft}\textit{Causal loop diagrams to systematically analyze market power in the Belgian sugar value chain}{\textquotedblright}. Biely K, Mathijs E, Van Passel S, AIMS Agriculture and Food \textbf{4}, 711 (2019).   http://doi.org/10.3934/AGRFOOD.2019.3.711

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