Tsionas, Efthymios and Kumbhakar, Subal (2006): Estimation of Technical and Allocative Inefficiencies in a Cost System: An Exact Maximum Likelihood Approach.
Zhang, Rui and Sun, Kai and Delgado, Michael and Kumbhakar, Subal (2011): Productivity in China's high technology industry: Regional heterogeneity and R&D.
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