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Battese, G.E., Rao, D.S.P. and O’Donnell, J.C. (2004) A Metafrontier Production Function for Estimation of Technical Efficiencies and Technology Gaps for Firms Operating under Different Technologies. Journal of Productivity Analysis, 21, 91-103.
https://doi.org/10.1023/b:prod.0000012454.06094.29
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