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\bibitem{ChekolZewdie_etal2021} {\textquotedblleft}\textit{Agricultural technical efficiency of smallholder farmers in Ethiopia : a stochastic frontier approach}{\textquotedblright}. Chekol Zewdie M, Moretti M, Tenessa DB, Ayele ZA, Nyssen J, Tsegaye EA, Minale AS, Van Passel S, Land \textbf{10}, 246 (2021).   http://doi.org/10.3390/LAND10030246

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