2Gvlontzos, S Niavis, B Nanos. DEA approach for estimating the agricultural energy and environmental efficiency of EU countries [ J], Renewable & Sustainable Energy Reviews, 2014,9(40) :91 -96.
3D Li, T Nanseki, S Takeuchi. Measurement of AgriculturalProduction Efficiency and the Determinants in China Based on a DEA Approach: A Case Study of 99 Farms from He- bei Province [ J ]. Journal of the Faculty of Agriculture Kyu- shu University, 2012,57 ( 1 ) :235 - 244.
