5 IZA Discussion Papers
IZA Discussion Paper No. 5729
IZA Discussion Paper No. 4417
revised version published in: Empirical Economics, 2013, 45(1), 483-521
IZA Discussion Paper No. 4074
IZA Discussion Paper No. 1251
revised version published in: Labour Economics, 2010, 17 (1), 150-169
IZA Discussion Paper No. 729