3 IZA Discussion Papers
IZA Discussion Paper No. 7406
published in: Journal of Comparative Economics, 2015, 43(3), 690–705
IZA Discussion Paper No. 1531
published in: S. Kolm and J. Mercier Ythier (eds.), Handbook of the Economics of Giving, Altruism and Reciprocity Vol. 2, North Holland 2006
IZA Discussion Paper No. 1116
published in: Review of Economics of the Household, 2006, 4, 183 - 204