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| Authors: | Sung-ko Li Léopold Simar Paul W. Wilson Valentin Zelenyuk |
| Affiliation: | (1) Department of Economics, Hong Kong Baptist University, Hong Kong, China;(2) Institut de Statistique, Université Catholique de Louvain, Voie du Roman Pays 20, 1348 Louvain-la-Neuve, Belgium;(3) The John E. Walker Department of Economics, Clemson University, 222 Sirrine Hall, Clemson, SC 29634-1309, USA;(4) Kyiv School of Economics (EERC) and Kyiv Economics Institute, Kyiv, Ukraine |
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