3 IZA Discussion Papers
IZA Discussion Paper No. 9909
published in: Journal of Economics and Social Measurement, 2017, 42 (2), 101-121
IZA Discussion Paper No. 4712
published in: Journal of Applied Econometrics, 2012, 27 (3), 386-414
IZA Discussion Paper No. 3478
published in: Economics Letters, 2012, 115 (1), 85-87