6 IZA Discussion Papers
IZA Discussion Paper No. 15820
IZA Discussion Paper No. 14808
IZA Discussion Paper No. 10231
published in: American Economic Review: Economic Policy, 2017, 9 (4), 101 - 143
IZA Discussion Paper No. 7283
published in: Canadian Public Policy, 2013, 39 (4), 491-516
IZA Discussion Paper No. 7011
IZA Discussion Paper No. 1463
published in: P. Bevelander and D. DeVoretz (eds.), The Economics of Citizenship, IMER Press, Malmo Sweden, 2008