24 IZA Discussion Papers
IZA Discussion Paper No. 5896
published in: Applied Economics Letters, 2013, 20 (8), 799-803
IZA Discussion Paper No. 5754
IZA Discussion Paper No. 1996
published in: Quarterly Journal of Economics, 2007, 122 (2), 807-829
IZA Discussion Paper No. 1944
published in: Journal of the European Economic Association, 2006, 4 (2-3), 531-541
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