424 IZA Discussion Papers
IZA Discussion Paper No. 151
published in: Scottish Journal of Political Economy, 2001, 48 (3), 283-302
IZA Discussion Paper No. 134
published in: Journal of Labor Economics, 2004, 22(3), 553-584.
IZA Discussion Paper No. 78
published in: Empirical Economics, 2005, 30 (1), 1-22
IZA Discussion Paper No. 69
revised version published in: Journal of Economic and Social Measurement, 2007, 32 (1), 15-22
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