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the efficiency analysis, there were three efficient zinc smelters in the CRS model, 14 in the VRS model and 14 in the SBM …. The average efficiency was 0.458 based on the SBM, which indicates that there is room for improvement in efficiency. In … produced and used next to iron, aluminum, and copper. In this study, DEA (data envelopment analysis) was applied to measure the …
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