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Heshmati, Almas; Kumbhakar, Subal C. and Sun, Kai (2013). Estimation of productivity in Korean electric power plants:a semiparametric smooth coefficient model. IN: 13th European Workshop on Efficiency and Productivity Analysis. 2013-06-17 - 2013-06-20.

Zhang, Rui; Sun, Kai and Kumbhakar, Subal C. Re-examination of the growth mode and structural change of China’s manufacturing industry:based on semi-parametric smooth coefficient model. Economic Theory and Business Management, 5 , pp. 80-90.