3 IZA Discussion Papers
IZA Discussion Paper No. 10840
IZA Discussion Paper No. 9618
published in: International Tax and Public Finance, 2017, 24 (4), 575-615 doi:10.1007/s10797-017-9462-3
IZA Discussion Paper No. 6800
published in: International Social Security Review 2013, 66(2): 1-29