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Jan 13 2017 Pedro Macedo and Elvira Silva
  Sensitivity of directional technical inefficiency measures to the choice of the direction vector: a simulation study
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Jan 28 2011 Ioanna Keramidou , Angelos Mimis and Evangelia Pappa
  Identifying efficiency drivers in the greek sausage industry: a double bootstrap DEA approach
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Oct 11 2001 Efthymios Tsionas and Dimitris Christopoulos
  Efficiency measurement with nonstationary variables: an application of panel cointegration techniques
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