Park, Ha Sung; Kim, Daecheol - In: Journal of open innovation : technology, market, and … 5 (2019) 1, pp. 1-14
Non-ferrous metals are widely used as basic materials in various industrial fields, and zinc is a metal that is … efficiency of 43 zinc smelters in three countries in East Asia: Korea, China, and Japan. The constant returns to scale (CRS) and … the efficiency analysis, there were three efficient zinc smelters in the CRS model, 14 in the VRS model and 14 in the SBM …