423 IZA Discussion Papers
IZA Discussion Paper No. 134
及其作者hed in: Journal of Labor Economics, 2004, 22(3), 553-584.
IZA Discussion Paper No. 78
及其作者hed 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
Typ