84 IZA Discussion Papers
IZA Discussion Paper No. 116
published in: Journal of Applied Econometrics, 2001,16 (5), 619-636
IZA Discussion Paper No. 102
published in: Journal of Public Economics, 2003, 87 (5), 957-985
IZA Discussion Paper No. 84
published in: Ifo Studien, 2000, 46 (1), 73-98
IZA Discussion Paper No. 31
published in: Economie et Statistique, 2000, 332/333, 83-95