2 IZA Discussion Papers
IZA Discussion Paper No. 10072
revised version published in a href="https://onlinelibrary.wiley.com/doi/10.1002/jae.2711">Journal of Applied Econometrics, 2019, 34, 707-72
IZA Discussion Paper No. 7135
revised version published in: European Journal of Population, 2014, 30 (1), 35-63
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