4 IZA Discussion Papers
IZA Discussion Paper No. 17045
IZA Discussion Paper No. 10226
published in: Journal of Population Economics, 2017, 49, 108 - 122
IZA Discussion Paper No. 6741
revised version published in: Constitutional Political Economy, 2017, 28, 321-345
IZA Discussion Paper No. 2668
revised version published in: Economic Journal, 2011, 212 (552), 595 - 619