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\bibitem{Gezahegn_etal2019} {\textquotedblleft}\textit{Big is efficient : evidence from agricultural cooperatives in Ethiopia}{\textquotedblright}. Gezahegn TW, Van Passel S, Berhanu T, D{\textquoteright}Haese M, Maertens M, Agricultural Economics \textbf{50}, 555 (2019).   http://doi.org/10.1111/AGEC.12509

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