5 IZA Discussion Papers
IZA Discussion Paper No. 16253
IZA Discussion Paper No. 15831
IZA Discussion Paper No. 13064
IZA Discussion Paper No. 10811
revised version available as NBER Working Paper No. 23479
IZA Discussion Paper No. 5522
published in: Journal of Forecasting, 2013, 32 (4), 299 - 306.