43 IZA Discussion Papers
IZA Discussion Paper No. 6358
revised version published in: The Manchester School, 2014, 82 (3), 363-384
IZA Discussion Paper No. 5031
published in: B.E. Journal of Economic Analysis and Policy (Contributions), 2012, 12(1): 1935-1682
IZA Discussion Paper No. 2357
revised version published in: Journal of Human Resources, 2009, 44 (1), 171-198