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2013
Kumbhakar, Subal, Lozano-Vivas, Ana and Sun, Kai (2013). A flexible cost function model with risk. Working Paper. Aston University, Birmingham. (Unpublished)
2012
Bhaumik, Sumon, Dimova, Ralitza, Kumbhakar, Subal and Sun, Kai (2012). Does institutional quality affect firm performance? Insights from a semiparametric approach. Discussion Paper. IZA, Bonn (DE).
Zhang, Rui, Sun, Kai, Delgado, Michael S. and Kumbhakar, Subal (2012). Productivity in China's high technology industry:regional heterogeneity and R&D. Technological Forecasting and Social Change, 79 (1), pp. 127-141.
Sun, Kai and Kumbhakar, Subal (2012). Semiparametric smooth-coefficient stoachastic frontier model. IN: Congrès AFSE 2012. 2012-07-02 - 2012-10-04.