4 IZA Discussion Papers
IZA Discussion Paper No. 8613
published in: International Encyclopedia of Social and Behavioral Sciences, 2nd Edition, 2015
IZA Discussion Paper No. 4306
published in: Explorations in Economic History, 2010, 47 (4), 505-519
IZA Discussion Paper No. 2815
published in: T. Paul Schultz and John Strauss (eds.), Handbook of Development Economics, Vol. 4, Amsterdam: North-Holland, Elsevier, 2008
IZA Discussion Paper No. 870
revised version published in: Journal of Population Economics, 2006, 19(1), 25-54