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produced and used next to iron, aluminum, and copper. In this study, DEA (data envelopment analysis) was applied to measure the … the variable returns to scale (VRS) models, and the slack-based measure (SBM) were used for the analysis. As a result of … the efficiency analysis, there were three efficient zinc smelters in the CRS model, 14 in the VRS model and 14 in the SBM …
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