4 IZA Discussion Papers
IZA Discussion Paper No. 13272
published in: Economics Letters, 2020, 194, 109383
IZA Discussion Paper No. 13196
published in: Economics Letters, 2020, 192, 109253
IZA Discussion Paper No. 13168
IZA Discussion Paper No. 218
published in: Journal of Business and Economic Statistics, 2004, 22 (3), 312-321