44 IZA Discussion Papers
IZA Discussion Paper No. 2957
published in: Journal of Public Economics, 2009, 93 (3-4), 464-481
IZA Discussion Paper No. 2879
IZA Discussion Paper No. 2054
published in: International Economic Review, 2009, 50(1), 117-141
IZA Discussion Paper No. 1978
published in: Journal of Economic Literature, 2007, 45(3), 595-628