6 IZA Discussion Papers
IZA Discussion Paper No. 13464
IZA Discussion Paper No. 10881
published in: Public Choice, 2018, 174 (3-4), 315-334.
IZA Discussion Paper No. 9423
IZA Discussion Paper No. 9024
IZA Discussion Paper No. 8382
IZA Discussion Paper No. 2477
published in: Journal of Public Economics, 2007, 91 (5-6), 1197-1218