5 IZA Discussion Papers
IZA Discussion Paper No. 17088
IZA Discussion Paper No. 14349
IZA Discussion Paper No. 10821
revised version available as NBER Working Paper No. 23497
IZA Discussion Paper No. 6692
published as 'Testing for the Unconfoundedness Assumption Using an Instrumental Assumption' in Journal of Causal Inference 2014, 2, 187-199
IZA Discussion Paper No. 2738
published in: Journal of Econometrics, 2010, 155 (2), 99-116