23 IZA Discussion Papers
IZA Discussion Paper No. 7395
published in: Economics Letters, 2013, 120 (1), 112-116
IZA Discussion Paper No. 6835
published in: Journal of the European Economic Association, 2019, 17 (3), 678–724
IZA Discussion Paper No. 5116
published in: Social Indicators Research, 2012, 107 (3), 449-463
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