3 IZA Discussion Papers
IZA Discussion Paper No. 10657
published in: World Bank Economic Review, 2018, (323), 709-726.
IZA Discussion Paper No. 5778
published in: American Economic Journal: Macroeconomics, 2014, 6 (1), 102-133
IZA Discussion Paper No. 959
revised version published in: Economic Journal, 2007, 117, 508-529