56 IZA Discussion Papers
IZA Discussion Paper No. 3968
revised version published in: The B.E. Journal of Economic Analysis & Policy. Volume 10, Issue 1, ISSN (Online) 1935-1682, October 2010
IZA Discussion Paper No. 3515
published in: Economic Inquiry, 2008, 46 (3), 289-324
IZA Discussion Paper No. 3216
published in: Review of Economics and Statistics, 2010, 92 (2), 244-262
IZA Discussion Paper No. 3216
published in: Review of Economics and Statistics, 2010, 92 (2), 244-262
IZA Discussion Paper No. 2357
revised version published in: Journal of Human Resources, 2009, 44 (1), 171-198
IZA Discussion Paper No. 1048
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