8 IZA Discussion Papers
IZA Discussion Paper No. 13064
IZA Discussion Paper No. 10758
revised version available as NBER Working Paper No. 23412
IZA Discussion Paper No. 10456
IZA Discussion Paper No. 6770
substantially revised verion published in: Journal of Behavior & Economics, 2017, 139, 166-181
IZA Discussion Paper No. 6085
IZA Discussion Paper No. 4251
published in: American Economic Journal: Applied Economics, 2011, 3 (3), 188-220
IZA Discussion Paper No. 3134
published in: American Economic Journal: Applied Economics, 2009, 1(1), 136–63.
IZA Discussion Paper No. 2412
published in: Journal of Research on Educational Effectiveness, 2008, 1(1), 1-23