4 IZA Discussion Papers
IZA Discussion Paper No. 16511
IZA Discussion Paper No. 15492
IZA Discussion Paper No. 9113
revised version published in: American Economic Journal: Economic Policy, 2021, 13 (2), 26-57
IZA Discussion Paper No. 3009
published as 'Child care voucher and labour market behaviour: experimental evidence from Finland' in: Applied Economics, 2011, 43 (23), 3203 - 3212