4 IZA Discussion Papers
IZA Discussion Paper No. 12928
Published: Empirical Economics, 2020, (https://doi.org/10.1007/s00181-020-01893-5)
IZA Discussion Paper No. 3642
IZA Discussion Paper No. 2193
published in: Journal of Population Economics, 2011, 24 (1), 141-165
IZA Discussion Paper No. 1138
revised version published in: Journal of Applied Econometrics, 2009, 24 (7) 1095-1116