5 IZA Discussion Papers
IZA Discussion Paper No. 9574
IZA Discussion Paper No. 5081
published in: Japanese Economic Review, 2013, 64 (1), 73–97
IZA Discussion Paper No. 1997
published in: Journal of Business and Economic Statistics, 2014, 32 (2), 245-258
IZA Discussion Paper No. 1085
revised version published in: Economica, 2004, 71 (282), 275-298
IZA Discussion Paper No. 90
published in: Journal of Comparative Economics, 2000, 28 (4), 639-664