686 IZA Discussion Papers
IZA Discussion Paper No. 571
published in: Journal of Political Economy, 2004, 112 (S1), S226-S267
IZA Discussion Paper No. 515
IZA Discussion Paper No. 317
published in: Journal of Applied Econometrics, 2004, 19 (4), 455-472
IZA Discussion Paper No. 206
IZA Discussion Paper No. 118
published in: Journal of Health Economics, 2001, 20(5), 677-801
IZA Discussion Paper No. 22