227 IZA Discussion Papers
IZA Discussion Paper No. 1627
published in: Scandinavian Journal of Economics, 2008, 110 (4), 695-709
IZA Discussion Paper No. 1562
published in: Economics of Education Review, 2008, 27 (5), 564-574
IZA Discussion Paper No. 1156
published in: Economics of Education Review, 2008, 27 (1), 79-93
IZA Discussion Paper No. 658
published in: Economics Letters, 2003, 80 (2), 247-253.
IZA Discussion Paper No. 658
published in: Economics Letters, 2003, 80 (2), 247-253.
IZA Discussion Paper No. 503
IZA Discussion Paper No. 402
published in: American Economic Review, 2002, 92 (4), 957-980