156 IZA Discussion Papers
IZA Discussion Paper No. 638
IZA Discussion Paper No. 548
published in: Econometric Reviews, 2004, 23 (2), 167-174
IZA Discussion Paper No. 429
published in: Labour, 2003, 17 (3), 337-360
IZA Discussion Paper No. 354
revised version published as 'On the Role of Counterfactuals in Inferring Causal Effects' in: Foundations of Science, 2004, 9 (1), 65-101
IZA Discussion Paper No. 98
IZA Discussion Paper No. 91
published in: M. Lechner, F. Pfeiffer (eds.), Econometric Evaluation of Labour Market Policies, Heidelberg: Physica, 2001, 43-58