3 IZA Discussion Papers
IZA Discussion Paper No. 11818
IZA Discussion Paper No. 2584
published in: A.K. Dutt and B. Radcliff (eds.), Happiness, Economics, and Politics: Towards a Multi-Disciplinary Approach, 2009, Northampton, MA, Edward Elgar
IZA Discussion Paper No. 2494
published in: Journal of Economic Behavior and Organization, 2008, 68 (3-4), 433-444