4 IZA Discussion Papers
现正讨论文件No. 7695
published in: International Journal of Innovation Management, 2016, 20(7), 235-257.
现正讨论文件No. 842
published in: Journal of Public Economics, 2005, 89 (11-12), 2165-2181
现正讨论文件No. 634
published in: Journal of Labor Economics, 2005, 23 (3), 437-466
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