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Coelli, T.J., Prasada-Rao, D.S., O’Donnell, C.J. and Battese, G.E. (2005) An Introduction to Efficiency and Productivity Analysis. 2nd Edition, Springer, Berlin.
http://facweb.knowlton.ohio-state.edu/pviton/courses/crp394/coelli_Intro_effic.pdf

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