183 IZA Discussion Papers
IZA Discussion Paper No. 400
published in: Empirical Economics, 2005, 30 (2), 309-329
IZA Discussion Paper No. 391
published in: International Economics and Economic Policy, 2005, 1 (4), 329-348
IZA Discussion Paper No. 218
published in: Journal of Business and Economic Statistics, 2004, 22 (3), 312-321