103 IZA Discussion Papers
IZA Discussion Paper No. 507
published in: European Economic Review, 2002, 46 (4-5), 687-724
IZA Discussion Paper No. 396
published in: Journal of the Royal Statistical Society, Series A (Statistics in Society), 2005, 168 (3), 513-538
IZA Discussion Paper No. 300
published in: Journal of the European Economic Association, 2004, 2 (4), 696-719