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Energy efficiency of selected OECD countries: A slacks based model with undesirable outputs[J] . Nicholas Apergis,Goodness C. Aye,Carlos Pestana Barros,Rangan Gupta,Peter Wanke.Energy Economics . 2015
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An analysis of the economic determinants of energy efficiency in the European iron and steel industry[J] . Florens Flues,Dirk Rübbelke,Stefan V?gele.Journal of Cleaner Production . 2015