666 IZA Discussion Papers
IZA Discussion Paper No. 55
published in: Jahrbücher für Nationalökonomie und Statistik, 1999, 219 (3/4), 308-325
IZA Discussion Paper No. 41
published in: Swedish Economic Policy Review, 1998, 5(2), 303-343
IZA Discussion Paper No. 26
published in: Journal of Economic Literature, 2000, 38 (1), 77-114
IZA Discussion Paper No. 24
published in: Wirtschaftsdienst, 1998, 78 (11), 652-653
IZA Discussion Paper No. 11
published in: Applied Economics, 2002, 34 (7), 865-876