44 IZA Discussion Papers
IZA Discussion Paper No. 4502
revised version published in: Scottish Journal of Political Economy, 2013, 60 (2), 182-209.
IZA Discussion Paper No. 3918
published in: Industrial Relations, 2011, 50 (2), 354-374
IZA Discussion Paper No. 1620
published in: Scottish Journal of Political Economy, 2005, 52 (3), 406-450
IZA Discussion Paper No. 474
published in: British Journal of Industrial Relations, 2004, 42 (1), 125-148