23 IZA Discussion Papers
IZA Discussion Paper No. 1948
published in: Social Science Quarterly, 2006, 87 (5), 1344-1363
IZA Discussion Paper No. 1638
published in: Economic Inquiry, 2010, 48 (3), 651-667
IZA Discussion Paper No. 1098
published in: Journal of Applied Econometrics, 2005, 20 (6), 771-795
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