4 IZA Discussion Papers
IZA Discussion Paper No. 9381
published in: Pacific Economic Review, 2015, 20(4), 569-587
IZA Discussion Paper No. 2427
see DP9381 for extended and revised version published in: Pacific Economic Review, 2015, 20(4), 569-587
IZA Discussion Paper No. 1822
revised version published in: Journal of Economic and Social Measurement, 2008, 33 (1), 27-38
IZA Discussion Paper No. 836
published in: Economic Inquiry, 2005, 43 (4), 766-772