285 IZA Discussion Papers
IZA Discussion Paper No. 370
published in: Oxford Bulletin of Economics and Statistics, 2004, 66 (2), 205-237
IZA Discussion Paper No. 369
IZA Discussion Paper No. 109
published in: Journal of Econometrics, 2001, 102 (2), 271-309
IZA Discussion Paper No. 79
IZA Discussion Paper No. 8
published in: Staatswissenschaften und Staatspraxis, 1998, 9 (2), 191-208