63 IZA Discussion Papers
IZA Discussion Paper No. 1441
revised version published in: Journal of Population Economics, 2008, 21 (2), 339-371
IZA Discussion Paper No. 1015
published in: Economics Letters, 2006, 90 (1), 102-107
IZA Discussion Paper No. 762
revised version published as ''Evaluationg the Cost-Effectiveness of In-Work Benefits: A Simulation Study for Switzerland' in: German Economic Review, 2007, 8 (4), 447 - 467