3 IZA Discussion Papers
IZA Discussion Paper No. 10753
Published in: PLoS ONE, 2017, 12(8), e0183277
IZA Discussion Paper No. 4153
published in: Review of Development Economics, 2010, 14 (2), 374-385
IZA Discussion Paper No. 3616
published in: American Economic Review, 2010, 100 (5), 2340-2360