123 IZA Discussion Papers
IZA Discussion Paper No. 489
published in: Review of Income and Wealth, 2003, 49 (2), 221-245
IZA Discussion Paper No. 448
published in: Review of Economics and Statistics, 2002, 84 (2), 324-341
IZA Discussion Paper No. 364
published in: Journal of Economic Inequality, 2010, 8(2), 221–240