56 IZA Discussion Papers
IZA Discussion Paper No. 1085
revised version published in: Economica, 2004, 71 (282), 275-298
IZA Discussion Paper No. 216
published in: Economics of Education Review, 2002, 21(3), 263-276
IZA Discussion Paper No. 146
published in: Labour Economics, 2001, 8 (2), 161-180
IZA Discussion Paper No. 139
published in: Jahrbücher für Nationalökonomie und Statistik, 2008, 228 (5-6), 446-464, (Special Issue: Labormetrics)
IZA Discussion Paper No. 90
published in: Journal of Comparative Economics, 2000, 28 (4), 639-664
IZA Discussion Paper No. 47
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