6 IZA Discussion Papers
IZA Discussion Paper No. 7806
revised version published in: RAND Journal of Economics, 2015, 46 (4), 777-790
IZA Discussion Paper No. 7183
published in: Journal of Development Economics, 2013, 103, 99-106
IZA Discussion Paper No. 5325
improved version is available here
IZA Discussion Paper No. 2124
published as "When is it foolish to reward for A while benefiting from B" in: Journal of Labor Economics, 2008, 26 (4), 595-619
IZA Discussion Paper No. 1669
published in: B.E. Journal of Economic Analysis and Policy: Topics in Economic Analysis and Policy , 2008, 8 (1), Article 27