123 IZA Discussion Papers
IZA Discussion Paper No. 3466
published in: Institutions and Economic Development: Selected Papers from the ERF 14th Annual Conference, Economic Research Forum, Cairo, Egypt, 2008, 147-164
IZA Discussion Paper No. 3407
published in: American Economic Review, 2008, 98 (2), 49-53
IZA Discussion Paper No. 2976
published in: Journal of Human Resources, 2009, 44 (1), 251 - 276