44 IZA Discussion Papers
IZA Discussion Paper No. 1957
published in: Industrial and Labor Relations Review, 2007, 60 (2), 246-267
IZA Discussion Paper No. 1805
revised version published in: Journal of Law and Economics, 2009, 52 (3), 445-467
IZA Discussion Paper No. 1375
published in: Social Choice and Welfare, 2006, 27, 571-594
IZA Discussion Paper No. 1029
published in: Journal of Economic Integration, 2003, 18 (1), 60 - 104