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Sun, K 2015, 'Constrained nonparametric estimation of input distance function' , Journal of Productivity Analysis, 43 (1) , pp. 85-97. |
Parmeter, CF, Sun, K, Henderson, DJ and Kumbhakar, SC 2014, 'Estimation and inference under economic restrictions' , Journal of Productivity Analysis, 41 (1) , pp. 111-129. |