624 IZA Discussion Papers
IZA Discussion Paper No. 765
improved version available as IZA Discussion Paper No. 2124
IZA Discussion Paper No. 755
revised version published as IZA DP 1595
IZA Discussion Paper No. 647
revised version published in: Journal of Economics and Management Strategy, 2005, 14 (1), 187-207
IZA Discussion Paper No. 605
revised version published in: International Journal of Human Resource Management, 2005, 16 (1), 104-119