646 IZA Discussion Papers
IZA Discussion Paper No. 263
published in: Economica, 2002, 69 (276), 609-629
IZA Discussion Paper No. 216
published in: Economics of Education Review, 2002, 21(3), 263-276
IZA Discussion Paper No. 198
published in: European Early Childhood Education Research Journal, 2003, 11 (2), 159-175
IZA Discussion Paper No. 198
published in: European Early Childhood Education Research Journal, 2003, 11 (2), 159-175
IZA Discussion Paper No. 195
published in: Applied Economics, 2004, 36 (8), 803 - 816
IZA Discussion Paper No. 22