4 IZA Discussion Papers
IZA Discussion Paper No. 16858
IZA Discussion Paper No. 11742
published in: Review of Economics and Statistics, 2019, 101 (5), 853-864
IZA Discussion Paper No. 10405
substantially revised version published as 'Twin Birth and Maternal Condition' in: Review of Economics and Statistics, 2019, 101 (5), 853 - 864 / published as 'The Twin Instrument: Fertility and Human Capital Investment' in: Journal of the European Economic Association, 2020, 18 (6), 3090 - 3139
IZA Discussion Paper No. 1131