424 IZA Discussion Papers
IZA Discussion Paper No. 164
published in: Economica, 2002, 69(274), 295-326
IZA Discussion Paper No. 134
published in: Journal of Labor Economics, 2004, 22(3), 553-584.
IZA Discussion Paper No. 101
published in: International Journal of Manpower, 2001, 22 (1/2), 39-68
IZA Discussion Paper No. 69
revised version published in: Journal of Economic and Social Measurement, 2007, 32 (1), 15-22
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