4 IZA Discussion Papers
IZA Discussion Paper No. 5055
published in: Journal of Applied Econometrics, 2013, 28 (2), 275–296
IZA Discussion Paper No. 4627
published in: D. J. Besharov and K. A. Couch (eds.), 2012, Counting the Poor, Oxford University Press, 171-209. Also available as OECD Social, Employment and Migration Working Paper
IZA Discussion Paper No. 102
published in: Journal of Public Economics, 2003, 87 (5), 957-985