4 IZA Discussion Papers
IZA Discussion Paper No. 10297
IZA Discussion Paper No. 4572
published in: Economics of Education Review, 2010, 29 (5), 783-794
IZA Discussion Paper No. 2453
published in: International Journal of the Economics of Business, 2007, 14(2), 197-214
IZA Discussion Paper No. 1741
发表于:《金融archiv, 2007, 63 (2), 211-243
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